“Do not in an instant what an age cannot recompense.”

“Neither you nor any man alive shall do this unpunished: no, you shall give recompense to me with your life-blood.”
Nec pol homo quisquam faciet inpune animatus hoc nec tu; nam mi calido dabis sanguine poenas.

“I have sought to determine… the different relations of bulk, subsisting between the various parts of his frame; and to ascertain how far these relations become modified during his development, what they are in the flower of his age, and in what position they remain up to the instant of decay.”

“The moment is your only duty. Your duty at any time in your life is to do what you have to do from moment to moment. What you have to do is what you cannot avoid doing. What you cannot avoid doing is what you do.”

“Life changes in the instant. The ordinary instant.”

“At what age do you think it's appropriate to tell a highway it's adopted?”

“Don't let what you cannot do interfere with what you can do.”

“As you cannot do what you want,
Want what you can do”

“Crabbed age and youth cannot live together:
Youth is full of pleasure, age is full of care”

“You can do what you decide to do — but you cannot decide what you will decide to do.”