A false man, however physically strong he is or however great is his willpower, is kept down by his falsehood; it never allows him to rise. It eats into him because it is a rust. Those who have done great things in life, in whatever walk of life it be, have done them by the power of truth, the power of sincerity, of earnestness, of conviction; when that is lacking, power is lacking. What takes away man's power is doubt.