It is curious that many people seem to fear self-knowledge because they assume, and often quite wrongly, that it implies discovering only derogatory things about oneself. Actually, an important part of self-knowledge is that it gives one a better realization of the inner strength that can be called upon, of which one may be quite unaware.
Because it is easier to say, “I can’t,” than “I can,” or at least “I can try,” many people go through life unaware of untapped strength, even untapped ability. They haven’t explored their own capabilities. They really don’t know where their strength lies.