Doing splendidly if they have in them mere images of virtue

Cicero, On Duties, Book I, p.20

Since we do not live with men who are perfect and clearly wise, but with those who are doing splendidly if the have in them mere images of virtue, I think that we must understand this too: no one should be wholly neglected if any indication of virtue appears in him; moreover, one must particularly foster those who are most graced with the gentler virtues, modesty, restraint and [justice]...for a brave and great spirit in a man who is not perfect nor wise is generally too impetuous; but those other virtues seem rather to attach themselves to a good man.

A whole attitude of severity...

Foucault, The Care of the Self, p.39:

A mistrust of the pleasures, an emphasis on the consequences of their abuse for the body and the soul, a valorization of marriage and marital obligations, a disaffection with regard to the spiritual meanings imputed to the love of boys: a whole attitude of severity was manifested in the thinking of philosophers and physicians in the course of the first two centuries.

Finishing school for philosophers

Epictetus, Enchiridion, Chapter 33:

1. Settle on the type of person you want to be and stick to it...
2. Let silence be your goal...say only what is necessary and be brief about it...above all don't gossip about people, praising, blaming or comparing them. Try to influence your friends to speak appropriately by your example. If you find yourself in unfamiliar company, however, keep quiet.
3. Keep laughter to a minimum...
4. Avoid fraternizing with non-philosophers...
5. [Moderation in food, drink, sex...]
6. If you learn that someone is speaking ill of you, don't try to defend yourself against the rumors; respond instead with 'Yes, and he doesn't know the half of it, because he could have said more.'
7. [Stay away from crude amusements...]
8. When you are going to meet someone, especially someone deemed important, imagine to yourself what Socrates or Zeno would have done in that situation and you won't fail to get on, whatever happens. When you are going to house of someone influential, tell yourself that you won't find them in, that you will be locked out, that the door will be slammed in your face, that they won't give you the time of day. And, despite that, if it's the right thing to go, then go and face the consequences...
9. ...don't dwell at excessive length on your own deeds and adventures...
10. And avoid trying to be funny...
11. [don't swear too much...]
    

All such apparent tragedies...

Epictetus, Enchiridion, Chapter 21:

Keep the prospect of death, exile and all such apparent tragedies before you every day - especially death - and you will never have an abject thought, or desire anything to excess.

Persist and resist...

Epictetus, Fragments, 10:

...there are two vices much blacker and more serious than the rest: lack of persistence and lack of self-control...two words should be committed to memory and obeyed by alternately exhorting and restraining ourselves, words that will ensure we lead a mainly blameless and untroubled life...persist and resist.

Temperance

Which words are used to describe the virtue of temperance?

Seneca: self-control

Marcus Aurelius: austerity, abstinence, moderation, patience, resignation (Marcus Aurelius, Meditations, Book Five, 5)

No one could ever accuse you of being quick-witted.

Marcus Aurelius, Meditations, Book Five, 5:

No one could ever accuse you of being quick-witted.
Alright, but there are plenty of other things you can't claim you "haven't got in you." Practice the virtues you can show: honesty, gravity, endurance, austerity, resignation, abstinence, patience, sincerity, moderation, seriousness, high-mindedness.