"If you don't know by now, you're never going to know"

This quote by Jermaine Dupri is an uncomplicated and blunt declaration that implies a sense of aggravation and resignation. It suggests that the person being attended to has had sufficient chance to find out or comprehend something, but for some reason, they have not had the ability to grasp it. The use of the expression "by now" suggests that there has been a significant quantity of time for the person to acquire knowledge or insight, but they have failed to do so. The addition of "you're never ever going to know" emphasizes the concept that the person is beyond help or hope in comprehending the subject at hand. Overall, this quote conveys a sense of disappointment and finality.