Sapiens vivit quantum debet, non quantum potest. - Seneca

It would be some consolation for the feebleness of ourselves and our works, if all things should perish as slowly as they come into being; but as it is, increases are of sluggish growth, but the way to ruin is rapid.

Much must also be withdrawn into oneself: for a well-composed conversation of differences disturbs and renews the affections, and infuriates whatever is weak in the mind and has not been cared for...
Loneliness will cure the hatred of the crowd, the boredom of solitude will be cured by the crowd.
... A certain dullness and languor of the mind is born from constant toil.
...Nor would the desire of men so much tend to this, unless play and fun had a kind of natural voluptuousness. The frequent use of which will relieve all the weight of the soul and all the vigor.
For sleep is also necessary for refreshment, but if you continue it day and night, death will result.

I fancy that many men would have arrived at wisdom if they had not fancied that they had already arrived.