Nothing is so certain as the unexpected.
天有不测风云，人有旦夕祸福。
Nothing seek, nothing find.
无所求则无所获。
A little of every thing is nothing in the main.
每事浅尝辄止，事事都告无成。
A great ship asks deep waters.
大船要走深水。（蛟龙要在海中游。）
The best physicians are Dr. Diet, Dr. Quiet, and Dr. Merryman.
节食博士、精心博士、快乐博士，三人都是最好的医生。
He that once deceives is ever suspected.
骗人一次，受疑一世。
Empty wagons rattle loudest.
空车响声大。
Nothing so bad but might be a blessing.
塞翁失马，焉知非福。