The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts.

There is only one corner of the universe you can be certain of improving, and that’s your own self.

Curiosity is one of the most permanent and certain characteristics of a vigorous intellect.

It is certain, in any case, that ignorance, allied with power, is the most ferocious enemy justice can have.

The real person you are is revealed in the moments when you’re certain no other person is watching. When no one is watching, you are driven by what you expect of yourself.

It is very difficult to have a free, fair and honest press anywhere in the world. In the first place, as a rule, papers are largely supported by advertising, and that immediately gives the advertisers a certain hold over the medium they use.