The past, the present and the future are really one: they are today.

I know not why there is such a melancholy feeling attached to the remembrance of past happiness, except that we fear that the future can have nothing so bright as the past.

Enjoy present pleasures in such a way as not to injure future ones.

The wise man must remember that while he is a descendant of the past, he is a parent of the future.

For all of its uncertainty, we cannot flee the future.