Riddle: Be you ever so quick, with vision keen, by your eyes, we are never seen. Unless perchance it should come to pass, you see our reflection in a looking glass. What are we?
Did you know the fact that our eyes never get rest? Even when we close our eyes, our eyelids are the part of our eyes that get rest not our eyes themselves. Even though they do not need rest and work all the time, there is one thing they cannot see, what is this thing?
Of course, your own eyes. This is what the riddle indicates when saying by your eyes we are never seen. There is only one way of seeing your own eyes and that is to look into a mirror, of course even then you only see the reflection of your eyes.
The answer of this riddle is your own eyes.