The supreme misfortune is when theory outstrips performance

Whoever despises the high wisdom of mathematics nourishes himself on delusion and will never still the sophistic sciences whose only product is an eternal uproar.

The water which rises in the mountains is the blood which keeps the mountain in life.

Whoever in debate quotes authority uses not intellect, but memory.

Every action needs to be prompted by a motive.

How many emperors and how many princes have lived and died and no record of them remains, and they only sought to gain dominions and riches in order that their fame might be ever-lasting.

I have been impressed with the urgency of doing. Knowing is not enough; we must apply. Being willing is not enough; we must do.