You can never step into the same book twice, because you are different each time you read it.
John Barton

You can not do what you want to do unless you know the correct technique. The only other way you can learn how to do it is by doing it yourself, which would take twice as long than if you went to school.
Boris Vallejo

You can't make a souffle rise twice.
Alice Roosevelt Longworth

You cannot step into the same river twice.
Heraclitus

You could not step twice into the same rivers; for other waters are ever flowing on to you.
Heraclitus

You know what, rip me off once, shame on me. But twice? I'm coming after you and taking back what's mine.
Billy Mays

You only live twice. Once when you are born and once when you look death in the face.
Ian Fleming

Youngsters of the age of two and three are endowed with extraordinary strength. They can lift a dog twice their own weight and dump him into the bathtub.
Erma Bombeck