Nothing is more difficult than knowing what you really think.

Sometimes it is harder to accede to a thing than it is to see its truth.

"The word "belief" is a difficult thing for me. I don't believe. I must have a reason for a certain hypothesis. Either I know a thing, and then I know it - I don't need to believe it"

You have to be careful what you think you know.

If there's something you really want to believe, that's what you should question the most.

It’s hard nowadays to get people to believe things. At least good things.

When you know something, really know something, it tends to stand the test of time

To believe is to know that one believes, and to know that one believes is no longer to believe.

There is a great deal of difference in believing something still, and believing it again.

Believing takes practice.

You should be convinced of the authenticity of what you have, but you must also be humble enough to say that we don't know everything. And since we don't know everything, we must accept that another person may believe something else.

First we have to believe, and then we believe.

It is startling to realize how much unbelief is necessary to make belief possible.

The hard part of intellectual life is separating what is true from what will get you liked.