Intense, unexpected suffering passes more quickly than suffering that is apparently bearable; the latter goes on for years and, without our noticing, eats away at our souls, until, one day, we are no longer able to free ourselves from the bitterness and it stays with us for the rest of our lives.
The alchemists spent years in their laboratories, observing the fire that purified the metals. They spent so much time close to the fire that gradually they gave up the vanities of the world. They discovered that the purification of the metals had led to a purification of themselves.
The journey towards the top of the mountain is always longer than you think. Don't fool yourself: the moment will come where what seemed to be close to you is in fact still very far away.