"Plus je vois les hommes, plus j'admire les chiens" (unknown, to me anyway)

(The more I see [of] men, the more I admire dogs)

and

"The existence of a limit to science is, however, made clear by its inability to answer childlike elementary questions having to do with first and last things..." -- Peter Medawar (who IIRC wrote a fascinating book about spotted mice and that gene/DNA scenario).