What I am visible to you, you cannot see me, but when I am invisible, you long to see me. I am plenty with someone patient, but all the more scarce with a hasty one. I am greater than all, but still in the control of those who value my existence. Who am i?

Why this works

This riddle plays with the abstract concept of "time" and its perception. The first part highlights how we can feel the passage of time (visible in the sense of awareness), yet we can't actually see it—like watching the clock tick but not the time itself. The idea of being "plenty with someone patient" suggests that those who take their time appreciate it more, while the hasty miss out on its value. Finally, "greater than all" signifies the immense importance of time in our lives, yet it remains in the control of those who recognize and respect its significance. Overall, the riddle cleverly encapsulates the dual nature of time: something we can't see but deeply desire and control based on our approach to life.