Cicero.
What is it to be a gentleman? It is to be honest, to be gentle, to be generous, to be brave, to be wise, and, possessing all these qualities, to exercise them in the most graceful outward manner.
Thackeray.
Teach me to feel another's woe,
To hide the fault I see;
That mercy I to others show,
That mercy show to me.
Pope.
"The Persians say of noisy, unreasonable talk: 'I hear the noise of the mill-stone, but I see no meal.'"