“Philosophers who have supposed that actual action was required if 'good' were to be used in a sincere evaluation have got into difficulties over weakness of will, and they should surely agree that enough has been done if we can show that any man has reason to aim at virtue and avoid vice. But is this impossibly difficult if we consider the kinds of things that count as virtue and vice? Consider, for instance, the cardinal virtues, prudence, temperance, courage and justice. Obviously any man needs prudence, but does he not also need to resist the temptation of pleasure when there is harm involved? And how could it be argued that he would never need to face what was fearful for the sake of some good? It is not obvious what someone would mean if he said that temperance or courage were not good qualities, and this not because of the 'praising' sense of these words, but because of the things that courage and temperance are.”

“The act of defending any of the cardinal virtues has today all the exhilaration of a vice. Moral truisms have been so much disputed that they have begun to sparkle like so many brilliant paradoxes.”

“The extremes of vice and virtue are alike detestable; absolute virtue is as sure to kill a man as absolute vice is, let alone the dullnesses of it and the pomposities of it.”

“Our virtues make us; but virtues are not enough, we must deploy our vices at times.”

“Distrust was counted as a democratic virtue, and over-confidence as a democratic vice.”

“Virtue, if not in action, is a vice,
And, when we move not forward, we go backward.”

“I do not merely assert that the ideal orator should be a good man, but I affirm that no man can be an orator unless he is a good man. For it is impossible to regard those men as gifted with intelligence who on being offered the choice between the two paths of virtue and of vice choose the latter, nor can we allow them prudence, when by the unforeseen issue of their own actions they render themselves liable not merely to the heaviest penalties of the laws, but to the inevitable torment of an evil conscience.”
Neque enim tantum id dico, eum qui sit orator virum bonum esse oportere, sed ne futurum quidem oratorem nisi virum bonum. Nam certe neque intellegentiam concesseris iis qui proposita honestorum ac turpium via peiorem sequi malent, neque prudentiam, cum in gravissimas frequenter legum, semper vero malae conscientiae poenas a semet ipsis inproviso rerum exitu induantur.

“Curiosity can be called a virtue or a vice, depending on what kind of elementary ethics one reads; in our house at Brekkukot, curiosity was considered on a par with thievishness.”

“Moderation in temper, is always a virtue; but moderation in principle, is a species of vice.”

“The use of science in the practice of virtue, is considerable: the man who knows the beauty of virtue will follow it, however possible. Knowing the evil of wrong, he will avoid it, however possible. He listens to worthy praise, and keeps his distance from unworthy praise. From this is derived that science has a part in every virtue, and that ignorance has one in every vice. Man who is illiterate and who still practices virtue must be extremely pure, a virtuous being. This is the state of Prophets (PBUH) because God had conveyed goodness to them without they acquiring it from men.”