exceptions quotes

I’m here as a product of process of evolution, which doesn’t make very many exceptions. And which rates life relatively cheaply.

In experimental philosophy, we are to look upon propositions inferred by general induction from phenomena as accurately or very nearly true, notwithstanding any contrary hypotheses that may be imagined, till such time as other phenomena occur by which they may either be made more accurate or liable to exceptions.

I should like to know if, taking this old Declaration of Independence, which declares that all men are equal upon principle, you begin making exceptions to it, where will you stop? If one man says it does not mean a Negro, why not another say it does not mean some other man?