Clothes make the man. Naked people have little or no influence on society. You cannot depend on your eyes when your imagination is out of focus. As in the words of Wayne Dyer, when you change the way you look at things, the things you look at change. Sometimes to know with certainty that a particular thing is "true", will actually be the very thing that keeps you from attaining the things you seek to achieve.
Sometime, somewhere you take something to be the truth. But if you cling to it too strongly, then even when the truth comes in person and knocks on your door, you will not open it.
We are always more anxious to be distinguished for a talent which we do not possess, than to be praised for the fifteen which we do possess. Sometimes we are too close to the scene, to see clearly. We "know" ourselves so well that we cannot see how we are perceived by others. Our opinion of ourselves is only "one" opinion and it may not be the truth.