If the present civilisation does not acquire some stable moral fondations ("bases morales stables", Fr.), its existence will hardly be more assured than that of the civilisations that have preceeded it, and which have fallen (or collapse, or failed).
The fool who has not sense to discriminate between what is good and what is bad is well nigh as dangerous as the man who does discriminate and yet chooses the bad.
Science is about finding ever better approximations rather than pretending you have already found ultimate truth.
A casual stroll through the lunatic asylum shows that faith does not prove anything.
Colouring does not depend on where the colours are put, but on where the lights and darks are put, and all depends on form and outline, on where that is put.
Murder in the murderer is no such ruinous thought as poets and romancers will have it; it does not unsettle him, or fright him from his ordinary notice of trifles; it is an act quite easy to be contemplated.