Refer to : 3-7. Haneul of Mind in On Samjae and Kang & Yu

The problem of sight is connected to that of mind. Because you fea his fist you come to see it despite that you have to see his or her eyes all the way. Masters should know this deep source of problem. Otherwise they cannot correct their students' problem. If you see the exact relations of each things in TKD and mind, you will see the whole shape of mind, not vaguely but clearly and distinctly.