“All things come into being by conflict of opposites.”

“It follows at once from the last proposition that the centre of gravity of any triangle is at the intersection of the lines drawn from any two angles to the middle points of the oppositesides respectively.”

“Every action has an equal and opposite reaction”

“The content of your character is your choice. Day by day, what you choose, what you think and what you do is who you become.”

“No man ever steps in the same river twice, for it's not the same river and he's not the same man.”

“Good character is not formed in a week or a month. It is created little by little, day by day. Protracted and patient effort is needed to develop good character.”

“Abundance of knowledge does not teach men to be wise.”