Full Idea
Frege's 1879 logic transformed philosophy because it greatly expanded logic's reach - what thought can achieve unaided - and hence compelled a re-examination of everything previously said about the grounds of thought when logic gives out.
Gist of Idea
Frege changed philosophy by extending logic's ability to check the grounds of thinking
Source
comment on Gottlob Frege (Begriffsschrift [1879]) by Michael Potter - The Rise of Analytic Philosophy 1879-1930 Intro
Book Reference
Potter,Michael: 'The Rise of Anaytic Philosophy 1879-1930' [Routledge 2020], p.1
A Reaction
I loved the gloss on logic as 'what thought can achieve unaided'. I largely see logic in terms of what is mechanically computable.