Estrangement (n.) is when they both say something ironical to each other and neither of them feels the irony.
Estrangement (n.) shows when both men inject irony into their remarks and neither feels the irony of it.
Estrangement (n.) from one's age (n.) is a voyage: driven out onto the ocean of past world-outlooks, one sees for the first time the whole shape of one's own coast.
Estrangement (n.) from a friend can be an act of love: when he belongs more to another, or our thinking would ruin him, we take an injustice on ourselves to give him a good conscience in renouncing us.
Estrangement (n.) can begin at a footbridge: asked 'Do you want to cross to me?', you no longer wanted to — and since then mountains and rivers lie between us.
Estrangement (n.) that is the law above us should make former friends more venerable to each other, and the memory of their friendship more sacred.