If you have to ask, you can't afford it!

Asked: "Is not commercial credit based primarily upon money or property?" "No sir," replied Morgan. "The first thing is character." "Before money or property?" "Before money or anything else. Money cannot buy it…Because a man I do not trust could not get money from me on all the bonds in Christendom.

A man always has two reasons for what he does-a good one and the real one.

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.