“Do not let what you can't do interfere with what you can do.”
“Do not let what you cannot do interfere with what you can do.”
“Don't let what you cannot do interfere with what you can do. ”
“Don't let what you can't do get in the way of what you can do.”
“Never let the things you can't do, stop you from doing what you can.”
“If you can't do what you want, do what you can.”