He would be wise who knew all things beforehand.
More Dutch Proverbs:
Everything has a wherefore.Dutch
He that would please all, and himself too, Undertakes what he cannot do.
Dutch
Who undertakes too much, succeeds but little.
Dutch
A dog with a bone knows no friends.
Dutch
Don't overstrain your bow -- it may break.
Dutch
He is too idle to fetch his breath.
Dutch