With such evidence, as well as the sealed doorway between the two guardian statues of the King, the mystery gradually dawned upon us. We were but in the anterior portion of a tomb.
You must accept that you might fail; then, if you do your best and still don't win, at least you can be satisfied that you've tried. If you don't accept failure as a possibility, you don't set high goals, you don't branch out, you don't try - you don't take the risk.