When you learned calculus did you learn all of the proofs for the power rule, chain rule etc? Could you derive them yourself without help. I can memorize this stuff no problem but when I get too far away from the proof (i.e. when it's not present in my mind/ when I'm not convincing myself of it in the moment) it seems like what I'm doing is just black magic. I'm using Kline and it's well written and thorough, but once I get past the gritty method of increments stuff it feels almost like I've gone right from ASM to just programming in python (i.e. I'm in baby town). Is this a normal feeling?