these are not contradictions. or....

Tolerate everyone. Except people who are intolerant.

Don't judge. Except people who judge.

You can't know anything except that you can't know anything.

Never say never, except for the time just now.

No one can be certain - except about this fact.

Some love to point out that none of these can be true, because they contradict themselves. But, that misses the whole point. They are not meant to be true or false, they are meant to be weights and scales - from yesterday - that simply tip the balances very strong one way or another and acknowledge in their very statement there is no 100%.