This World is one great City, and one if the substance whereof it is fashioned: a certain period indeed there needs must be, while these give place t… - Epictetus

Thus, whatever phase of things human and divine you have apprehended, you will be wearied by the vast number of things to be answered and things to be learned. And in order that these manifold and mighty subjects may have free entertainment in your soul, you must remove therefrom all superfluous things. Virtue will not surrender herself to these narrow bounds of ours; a great subject needs wide space in which to move. Let all other things be driven out, and let the breast be emptied to receive virtue.

The man has to learn ‘what each specific thing means’, as Socrates often said, and stop casually applying preconceptions to individual cases.
This is the cause of everyone’s troubles, the inability to apply common preconceptions to particulars. Instead the opinions of men as to what is bad diverge.

Tell yourself what you want to be, then act your part accordingly.