No man ever properly calculates from time to time what it is his duty to avoid.
Whatever you want to teach, be brief.
He who is upright in his way of life and free from sin.
Remember to keep the mind calm in difficult moments.
For a man learns more quickly and remembers more easily that which he laughs at, than that which he approves and reveres.
All singers have this fault: if asked to sing among friends they are never so inclined; if unasked, they never leave off.