- Thus Spake Zarathustra
It is now so ingrained in the ethos of Celtic fans that anyone who couldn't quote Jock Stein declaring that the two greatest teams in the world, without fans, are nothing would be viewed with deep suspicion.
The smart knew him to be right; the wise wouldn't have needed him to tell them.
But if any doubted the great man, they need only have witnessed Celtic playing Atletico Madrid behind closed doors, in 1985, to understand how surreal and lacking in entertainment value football without fans is.
Contrast the two occasions and results.
In one, in a hostile atmosphere, Celtic produced an excellent result. In the surreal return leg, the absence of Celtic fans was Atletico's edge.
This was, of course, a hangover from one of the worst experiences of my life supporting Celtic - the shameful Rapid Vienna affair.
Celtic were treated unjustly by UEFA but some fans were suckered, too. And how ironic that the actions of a few fans should have had such a history-defining effect on Celtic's future.
It would not be until the reign of Martin O'Neill that European football would be a positive experience for the club.
It is the presence of tens of thousands of fans, packing stadiums, that makes football and a few can undermine the experience for everyone. We have seen much of this over thelast week.
I was looking forward to the match on Saturday and, of course, very keen that Celtic should win. I explained as much on this blog.
But, however hard some try to say otherwise, I didn't have the butterflies, the anxiety or the adrenal excitement that preceded matches with the real Rangers.
None of that - the stupid superstitions, the rituals, the trying to find reassurance from other Celtic fans that we had enough to win - was there.
Yet, we witnessed a fantastic occasion.
And why? Because the ground was full and bouncing.
Tuesday was as cringe-inducing a night of football as you could ever witness. In fact, it was the sort of score against Celtic that I have always hoped never to witness.
But while the anticipation, rapidly metamorphosed into shock and then a worrying, helpless sense of inevitability, the sounds of the crowd made a no-contest into an event.
Because fans, without football, can watch Bake-Off but football, without fans, is nothing.
I have a friend who once played bass with a successful band. (He's not personally famous but he had his moment in the sun.) He told me that the clichés about performance were true:
"The crowd gives you energy; you give it back to the crowd and then they give it back to you - amplified!"
And this was what we witnessed on Saturday – and on Tuesday (though Tuesday's recipients were not in green and white).
Yes, the game with The Rangers was a grudge match - it had added "local derby" spice and the premature rhetoric had cranked that up.
But it was neither our most difficult nor important match of the season so far. It wasn't even the most serious SPFL test, but Celtic fans spent the rest of Saturday smiling, laughing, celebrating - energised.
But that's not the whole story. All of us who have followed football know there is a joyful difference between witnessing players who can revel in such an atmosphere and those who wilt.
We've all seen them - the talented players who either get intimidated by aggressive fans in away matches or collapse under the weight of expectation, best articulated by Tony Cascarino in his hilarious autobiography. (Tony, you were so funny that I forgave you for the way you performed for us.)
Tuesday saw some do just that. The younger players, we can excuse completely. One or two more established professionals should enjoy no such indulgence.
None of the players at the Camp Nou would gain pass marks. But this was an occasion on which we saw the real “men and boys” in our own team.
Saturday was particularly enjoyable because, when the volume was cranked up to 11, we saw a team with belief in themselves, confidence in their coaches and trust in each other. On such occasions, stars rise.
And it will come as no surprise that the brightest of them all on Saturday was Moussa Dembele.
When we signed a young striker with a solid English championship season behind him, I was encouraged and pleasantly surprised. It was the sort of signing many of us had been asking for in the "on plan" years.
When he stepped up to take that penalty against Astana, many of us who had been around for a while sensed a defining moment.
Saturday was another great test, passed with flying colours and, despite being “psyched out” by the Barca keeper Ter Stegen and placing a mid-level penalty, I have no criticism of him.
Moussa has strength, close control and the ability to combine both to hold the ball in the six-yard box under intense pressure from defenders.
It is exactly the sort of skill that one former Celtic striker, now sadly reduced to being a SkySports pundit, once said he had tried to copy from Kenny Dalglish, believing that the tight confines of the playground had been an ideal training ground. (Not, not you, Andy Walker, nobody is interested in your playing style - I'm talking about Charlie Nicholas.)
People quite rightly talked about the variety of goals from Saturday but another indication of Dembele's quality was his ability to bring difficult long passes under control with his chest.
That doesn't just demonstrate learned technique but the ability to remain calm while 60,000 people are screaming at you.
And I saw no indication that he was dealing with the Camp Nou atmosphere any less well than anyone else. Playing a lone striker role against the world's best team – which is hamering your teammates behind you – is a tough task and Moussa was not the worst player on display.
Tuesday could have crushed the spirit of the team but there are still positive signs.
We have, in varying measures, skill, speed, solidity, creativity and versatility, but not enough of any of them yet. We are a long way from being a top team, as Barcelona showed – but then they have done something similar to genuinely top teams (like Valencia).
But the general direction is positive.
We faced a monumentally difficult task in Barcelona on Tuesday – and we failed.
Let's be clear - anything professional and competitive against Barca would have been a success. None of our players left with their reputations enhanced but while the occasion was too early for some, a few at least fought until the end – as always, Scott Brown – and a few let us down both in terms of performance level and courage (also known as commitment).
I expect that their names have been duly noted by the coaching staff and that they will follow some of their “team hangover” colleagues out the door when an opportunity arises.
You can make mistakes, you can play badly – not acceptable but understandable. If you play for Celtic, you better have the pride and moral courage to conspicuously give everything when things are going against you – for your teammates, your coaches and the fans.
If your hamstring has once troubled you so badly that you signalled to the bench when struggling with your lower-division rivals – and then recovered when you realised your team had used all three subs – you had better make the most of the privilege of representing Celtic against the world's finest footballers.
If an easy win makes you so cocky that you want to run around with a beachball on your head, then don't try to be the invisible clown three days later, when real footballers are running your team ragged – and real men are doing their best to try to combat it.
We have seen two mismatches over the last five days, bringing joy and discomfort to us, in equal measure.
Yet, they have both been great football occasions in their own way, because, despite the malicious jibes of those small-minded officials of a small-time club, overwhelmingly the fans made them so.
Those same fans make football – and footballers – something.
It is encouraging that almost all of our players over the two games recognised that.
Brendan Rodgers poignantly quoted Jock Stein on Saturday on the 31st anniversary of Jock's death (and the fifth anniversary of Brendan's own father).
Brendan and his coaching team – so strong on detail and so demanding of intensity – will surely be reinforcing some of Jock's simple values over the coming months.
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