Cicero: “Where can you find the man to prefer his friend's advancement to his own?”

But for the most part, people are led to wrong-doing in order to secure some personal end; in this vice, avarice is generally the controlling motive.

For we are all attracted and drawn to a zeal for learning and knowing; and we think it glorious to excel therein, while we count it base and immoral to fall into error, to wander from the truth, to be ignorant, to be led astray.

In the matter of a promise one must always consider the meaning and not the mere words.

Thus apparent expediency is outweighed when placed in the balance against moral rectitude.