How far your eyes may pierce, I cannot tell; striving to better, oft we mar what's well

How far your eyes may pierce, I cannot tell; striving to better, oft we mar what's well

The quote “How far your eyes may pierce, I cannot tell; striving to better, oft we mar what's well” is from William Shakespeare's play, King Lear. This line is spoken by the character Gloucester in Act 1, Scene 1. Gloucester is reflecting on the limitations of human perception and the consequences of trying to improve upon something that is already good.