Adversity

Adversity borrows its sharpest sting from our impatience. Bishop Horne
Adversity has the effect of eliciting talents which in prosperous circumstances would have lain dormant. Horace

Anger

Ability wins us the esteem of the true men; luck that of the people.   La Rochefoucauld
Consider well what your strength is equal to, and what exceeds your ability.   Horace
An able man shows his spirit by gentle words and resolute actions; he is neither hot nor timid. Chesterfield