He who is attempting to develop his will should always try to keep a cool head. He should keep a balanced mind under all conditions. He will have to train or discipline the mind, it is worth practicing.
Balance of mind is one of the vital characteristics of a developed Jnani or Yogi. That Yogi can keep a balanced mind at all times is really a strong and happy man. He will get sanguine success in all his undertakings. You may fail to maintain the balance of fifty attempts; but from the fifty first endeavor, you will get strength of will. You will slowly manifest balance of mind. You should not be discouraged in the beginning. Remember the story of ‘Bruce and the Spider.” Bruce learnt from the spider. He failed seven times but succeeded in the war in his eighth attempt.