Certain signs are the forerunners of certain events.

There never was a great soul that did not have some divine inspiration.

Mathematics is an obscure field, an abstruse science, complicated and exact; yet so many have attained perfection in it that we might conclude almost anyone who seriously applied himself would achieve a measure of success.

All soils are not fertile.

Every one is least known to himself, and it is very difficult for a man to know himself.

Hatreds not vowed and concealed are to be feared more than those openly declared.

No one is so old that he does not think he could live another year.