The chief cause of human errors is to be found in the prejudices picked up in childhood.

Human wisdom remains always one and the same although applied to the most diverse objects and it is no more changed by their diversity than the sunshine is changed by the variety of objects which it illuminates.

Good sense is the most equitably distributed of all things because no matter how much or little a person has, everyone feels so abundantly provided with good sense that he feels no desire for more than he already possesses.

Each problem that I solved became a rule, which served afterwards to solve other problems.

Your joy is your sorrow unmasked. And the self-same well from which your laughter rises was often-times filled with your tears.

Omnia apud me mathematica fiunt.

Common sense is the most fairly distributed thing in the world, for each one thinks he is so well-endowed with it that even those who are hardest to satisfy in all other matters are not in the habit of desiring more of it than they already have.