Progress is the mother of all problems.

There are many ways to fall down, but there's only one way to stand up straight.

When once you have got hold of a vulgar joke, you may be certain that you have got hold of a subtle and spiritual idea.

No sceptical philosopher can ask any questions that may not equally be asked by a tired child on a hot afternoon.

All my authority in heaven and on earth has been given to me.

No man should leave in the universe anything of which he is afraid.

The reason that angels fly is that they take themselves so lightly.