There are plenty of fish in the sea.
The early bird catches the worm.
Truth is stranger than fiction.
The apple never falls far from the tree.
Two heads are better than one.
There's no use crying over spilled milk.
There's no such thing as a free lunch.
The proof of the pudding is in the eating.
The pen is mightier than the sword.
The grass is always greener on the other side.
The first step is always the hardest.
The fastest way to a man's heart is through his stomach.
The ends (don't) justify the means.
The devil is in the details.