Happy is the man who can make others better, not merely when he is in their company, but even when he is in their thoughts! - Seneca

Much must also be withdrawn into oneself: for a well-composed conversation of differences disturbs and renews the affections, and infuriates whatever is weak in the mind and has not been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.

The wise man is joyful, happy and calm, unshaken, he lives on a plane with the gods.

Quare deus optimum quemque aut mala valetudine aut luctu aut aliis incommodis adficit? quia in castris quoque periculosa fortissimis imperantur: dux lectissimos mittit qui nocturnis hostes adgrediantur insidiis aut explorent iter aut praesidium loco deiciant. Nemo eorum qui exeunt dicit 'male de me imperator mervit', sed 'bene iudicavit'.