Don't put all your eggs in one basket. Absence makes the heart grow fonder.

i think is almost a cliche but i like it anyway "What doesn't kill you makes you stronger..."

"The things we do, two by two, come back to us one by one."

Too many to list! :) But amongst the many of them: A person is known by the company he keeps. Blood is thicker than water. Haste makes waste. Seek and ye shall find. Hell hath no fury like a woman's scorn. In for a penny, in for a pound. When it rains, it pours. 'Tis better to have loved and lost, than never to have loved at all. Necessity is the mother of invention. Nothing is certain but death and taxes. Practice makes perfect. The devil finds work for idle hands. That which does not kill us makes us stronger. There's always more fish in the sea. The way to a man's heart is through his stomach. Those who do not learn from history are doomed to repeat it. Waste not want not. When the cat's away the mice will play. Where there's a will there's a way. You can lead a horse to water, but you can't make it drink. You can't get blood out of a stone. There's more than one way to skin a cat.

Actions speak louder than words. - it's tested many times :) Every cloud has a silver lining. - is the best one for me.