My pessimism extends to the point of even suspecting the sincerity of other pessimists.

There are moments when very little truth would be enough to shape opinion. One might be hated at extremely low cost.

A body of work such as Pasteur's is inconceivable in our time: no man would be given a chance to create a whole science. Nowadays a path is scarcely opened up when the crowd begins to pour in.

The ideal, without doubt, varies, but its enemies, alas, are always the same.

Truth is always served by great minds, even if they fight it.

I prefer the honest jargon of reality to the outright lies of books.

Kill one man, and you are murderer.