Adapt what is useful, reject what is useless, and add what is specifically your own.
Any alliance whose purpose is not the intention to wage war is senseless and useless.
Computers are useless. They can only give you answers.
Dad, you've done a lot of great things, but you're a very old man, and old people are useless.
Integrity without knowledge is weak and useless, and knowledge without integrity is dangerous and dreadful.
It is quite useless knocking at the door of heaven for earthly comfort. It's not the sort of comfort they supply there.
Just because something doesn't do what you planned it to do doesn't mean it's useless.
No one is useless in this world who lightens the burdens of another.
The production of too many useful things results in too many useless people.