I never allow myself to have an opinion on anything unless I know the other side’s argument better than they do.

Never allow oneself to have an opinion on anything when you don't know the other side's arguments better than they do.

Never make a calculation until you know the answer.

You do not have a right to an opinion. You have the right to an informed opinion. You do not have a right to be ignorant.

One should never judge anything unless it is known.

It is no good any longer having any opinion upon anything...

if any opinion is compelled to silence, that opinion may, for aught we can certainly know, be true. To deny this is to assume our own infallibility.

We can never know anything.

In all judgements by which we describe anything as beautiful, we allow no one to be of another opinion.

In my view, the novelist has no right to express his opinions on the things of this world. In creating, he must imitate God: do his job and then shut up.

If we are open only to discoveries which will accord with what we know already, we may as well stay shut.

Concerning that which cannot be talked about, we should not say anything.

We cannot shut the windows and pull down the shades; we cannot say, “I have learned all I need to know; my opinions are fixed on everything. I refuse to change or to consider these new things.” Not today. Not any more.

We cannot expect to gain true knowledge without acting upon our ideas.