It is useful to constantly observe, note, and consider.

Who sows virtue ought to reap honour.

Just as courage imperils life, fear protects it.

Music cannot be called otherwise than the sister of painting, for she is dependent upon hearing, a sense second to sight, and her harmony is composed of the union of its proportional parts sounded simultaneously, rising and falling in one or more harmonic rhythms.

O neglectful Nature, wherefore art thou thus partial, becoming to some of thy children a tender and benignant mother, to others a most cruel and ruthless stepmother? I see thy children given into slavery to others without ever receiving any benefit, and in lieu of any reward for the services they have done for them they are repaid by the severest punishments.

Iron rusts from disuse; water loses its purity from stagnation... even so does inaction sap the vigor of the mind.

The eye which turns from a white object in the light of the sun and goes into a less fully lighted place will see everything as dark.