"The year 1955 marked a crucial change in my mathematical work: the passage from analysis to geometry. I still recall the striking (but of course entirely subjective) impression of leaving rude and arid steps, only to find myself suddenly in a sort of promised land filled with luxurious riches, multiplied everywhere to infinity, so that it suffices to lay your hand anywhere you like to gather and explore."
https://www.privatdozent.co/p/the-anarchist-abstractionist-who-995