He wasn’t encouraging me to slack off.
He was trying to teach me that not everything is worth going for the ‘A’.
Being ‘perfect in everything’ means we’re giving equal attention to all things, when all things aren’t equally important.
Striving for ‘perfect’ means we are focused on the outcome rather than capturing the learning in the journey.
We’re putting a whole lot of life into gaining someone else’s judgement and approval of our work product.
There’s another option.
Get a ‘B’.