In this [episode], I read a piece from Thurston's essay "On proof and progress in mathematics", where he reflects on the importance of seeing mathematicians' progress and contributions much broader than just in proving new theorems.

William Thurston on Wikipedia: https://en.wikipedia.org/wiki/William_Thurston

Cover photo: from this Wikipedia page

The full essay: https://arxiv.org/pdf/math/9404236.pdf

Thurston's lecture "Knots to Narnia": https://youtu.be/IKSrBt2kFD4

Thurston's answer on MathOverflow about contributions in mathematics: https://mathoverflow.net/questions/43690/whats-a-mathematician-to-do/44213#44213