Mental strength is an essential attribute of success. As Krishna says in the Bhagavad Gita, " Success is achieved by the persevering. " In the pursuit of an objective or goal, one tends to get demoralised at the sight of obstacles or problems and hence may give up after a few failures in the path. Some even commit suicide after repeated failures and intense demoralisation, forgetting the fact that suicide is a great sin and life has been given to us for spiritual evolution and understanding the true reality. The mentally strong however, keeps on working towards their objective or goal in spite of repeated defeats and failures , and attains their ends. There are many teachings in the Hindu scriptures with respect to mental strength and also that taught by the masters. I would like to put down some of these teachings over here, which may act as a moral tonic to the discouraged and demoralised, and as a spur for those who are working to attain their goals and objectives.