If you have to ask how much it costs, you can't afford it.

A man always has two reasons for doing anything / a good reason and the real reason.

Go as far as you can see; when you get there, you'll be able to see farther.

The wise man bridges the gap by laying out the path by means of which he can get from where he is to where he wants to go.

No problem can be solved until it is reduced to some simple form. The changing of a vague difficulty into a specific, concrete form is a very essential element in thinking.

You can't pick cherries with your back to the tree.