Bott is often quoted as saying "Evrey mathematician has a secret weapon. Mine is Morse theory." Every time I see his name I've tried to look up a source. Finally found one:

https://mathoverflow.net/questions/100316/raoul-botts-quote-...

Anyway if you enjoyed this you might also enjoy

https://www.numdam.org/item/10.1007/BF02698544.pdf

I got confused because of the use of present tense as Bott's been gone for years. It needs a "(2002)"