When it comes to quotes, there’s no sense getting all original about it. Paraphrasing will get you places. As Oscar Wilde said, “Quotation is a serviceable substitute for wit”. Here’s proof:

Nothing can stop the man with the right mental attitude from achieving his goal;
nothing on earth can help the man with the wrong mental attitude.
-Thomas Jefferson

They can conquer who believe they can.
-Ralph Waldo Emerson

They can because they think they can.
-Virgil

If you think you can do a thing or think you can’t do a thing, you’re right.
-Henry Ford