Knowledge is something which you can use.
Belief is something which uses you.

Denial and affirmation are games which people play.
There are people who deny that they are capable of denying, and who would insist that people do not insist.

I have heard all that you have had to say to me on your problems.
You ask me what to do about them.
It is my view that your real problem is that you are a member of the human race.
Face that one first.

Opinion is usually something which people have when they lack comprehensive information.

Talent is the presence of ability and absence of understanding about the source and operation of knowledge.

Two people can illustrate crudity to you.
The first is the crude man, whom you see perceiving the diamond as a stone.
The other is the refined man, who makes clear to you the crudity of the first one.