It was all worth it. All those times Kyle Sinckler's mother Donna went without sleep between shifts in a police call centre - dealing with some nasty customers - and driving her son to rugby training.
All those times Eddie Jones backed his tight-head after he had lost his head in internationals, riled up by those who lit his short fuse.
All those nights at Battersea Ironsides, where they struggled to field 15 at times, where a young, talented, bullish boy was kept away from the boredom of a youth in Tooting - a place where Sinckler saw others turn to lives of crime - have been worth it for nights like this.
The Australia World Cup quarter-final was Sinckler's 32nd Test match - and clearly his best.
Kyle Sinckler delivered his best performance in an England shirt as they beat Australia
The prop scored one of England's four tries as they hammered the Wallabies in Oita
Afterwards Eddie Jones described him as the 'runaway rhino'. He was referring to the sensational try the prop scored - his first for England.
With the Wallaby defence looking at Billy Vunipola, Owen Farrell fizzed a pass to Sinckler instead. Tolu Latu, the Aussie hooker, had bit in and left a gaping hole.
But Sinckler had to spot it, he had to rampage through it, had to pump the legs and power to the line in order to score. He did all that and then lay on the ball, arms out-stretched either side in celebration, a big grin on his face.
'It was very special,' he said afterwards.
'It was quite nice that it all fell into plan. I was knackered afterwards. I said to Faz "take the minute and a half for the conversion!" I needed the rest.
Anthony Watson (left) also went over as England set up a tie with New Zealand in the semi-final
'That was a tough, tough Test match.' It was not just the try though. If anything Sinckler's cool head was what impressed most.
Back in February, when England lost to Wales in