Little by little old age renders the body less powerful.

Our character is not so much the product of race and heredity as of those circumstances by which nature forms our habits, by which we are nurtured and live.

Nulla (enim) res tantum ad dicendum proficit, quantum scriptio Nothing so much assists learning as writing down what we wish to remember.

When I consider the wonderful activity of the mind, so great a memory of what is past, and such a capacity of penetrating into the future: when I behold such a number of arts and sciences, and such a multitude of discoveries hence arising,--I believe and am firmly persuaded that a nature which contains so many things within itself cannot be mortal.

To study philosophy is nothing but to prepare one’s self to die.

No sensible man ever imputes inconsistency to another for changing his minds.

Nature loves nothing solitary, and always reaches out to something, as a support, which ever in the sincerest friend is most delightful.