Never confuse your right to say what you believe with a right to never be disagreed with and ridiculed for saying what you believe.

May we never confuse honest dissent with disloyal subversion.

The wise never confuse information or data, however prodigious or cleverly deployed, with comprehensive knowledge or wisdom...Be wise.

Whatever you do, never waste your thoughts on other people’s ill-informed opinions and guesses.

It is very important not to mistake hemlock for parsley; but not at all so to believe or not in God.

Let me never fall into the vulgar mistake of dreaming that I am persecuted whenever I am contradicted.

Do not impute to money the faults of human nature.

Don’t mistake your assumptions for the truth.

Never let anybody guess that you have a mind of your own. Above all be pure

Do not commit spiritual suicide through a passion for discussing metaphysical subtleties.

Let no one persuade you by word or deed to do or say whatever is not best for you.

Never let yourself be diverted, either by what you wish to believe, or what you think could have beneficent social effects if it were believed; but look only and solely at what are the facts.

Don't trust the person who has broken faith once.

Never believe anything that requires you to hate people who do not believe it.