We have to do due diligence.

That's always in the back of your mind. Can we be saving some money?

Until we do our due diligence, no one knows, ... Once you get in there, who knows. If they're enthusiastic, they might want to go for more.

Everything yields to diligence.

Diligence is the mother of good fortune.

The expectations of life depend upon diligence; the mechanic that would perfect his work must first sharpen his tools.