For me this statement does no good to you except on only one occasion! Hmm… what is that golden moment? When you are just appearing in an exam to make you feel good, relax and confident. Actually this is a delusional statement that can never do any good to you. Once you feel that you are the best then your further growth is halted, skill level deteriorates and you become less passionate. In other words this statement and belief can ruin your life. Only Allah Almighty knows everything about us and in this universe.