Thapasa means austerity. One must practise austerities. It means that one is pleased with what one has. Most of all it means that one is pleased with little. It also means the restraint of the senses. The development and practice of austerity is a great -power. Such a person is always pleased with little. As a result it is very easy for him to sacrifice many of his comforts, wealth, pleasures for the welfare of others.