Do not suffer a sudden impression to overbear your judgment.
If you are pained by any external thing, it is not this that disturbs you, but your own judgment about it.
Consider that thou dost not even understand whether men are doing wrong or not, for many things are done with a certain reference to circumstance. And, in short, a man must learn a great deal to enable him to pass a correct judgment on another man's acts.
Treat with utmost respect your power of forming opinions, for this power alone guards you against making assumptions that are contrary to nature and judgments that overthrow the rule of reason.