The person who knows only his side of the argument knows little of that.

He who knows only his own side of the case knows little of that.

He who knows only his own side of the case, knows little of that. His reasons may be good, and no one may have been able to refute them. But if he is equally unable to refute the reasons on the opposite side; if he does not so much as know what they are, he has no ground for preferring either opinion.

We truly know only what we have taught ourselves.

We hear and apprehend only what we already half know.

He who knows only his own side of the case knows little of that. His reasons may be good, and no one may have been able to refute them. But if he is equally unable to refute the reasons on the opposite side, if he does not so much as know what they are, he has no ground for preferring either opinion... Nor is it enough that he should hear the opinions of adversaries from his own teachers, presented as they state them, and accompanied by what they offer as refutations. He must be able to hear them from persons who actually believe them...he must know them in their most plausible and persuasive form.

We hear only half of what is said to us, understand only half of that, believe only half of that, and remember only half of that.

One knows so little. When one knows more it is too late.

We desire truth and find within ourselves only uncertainty.

We know ourselves only as far as we’ve been tested.

Opinion all too often leaves no room for anything but itself.

We suffer only until we realize that we can’t know anything.

A single fact will often spoil an interesting argument.

We hear only our own voices, still echoes returning to our emptiness.