You never know what you can do till you try. No man can serve two masters. Opportunity never knocks twice at any man's door. There's no place like home. A fair exchange is no robbery.
Every cloud has a silver lining.
You never miss the water till the well runs dry. If you lie down with dogs, you'll get up with fleas. He that would eat the fruit must climb the tree. Keep a thing for seven years and you'll always find a use for it. Faith will move mountains.