Until you have the inner discipline that brings calmness of mind, external facilities and conditions will never bring the joy and happiness you seek. On the other hand, if you possess this inner quality, calmness of mind, a degree of stability within, even if you lack the various external factors that you would normally require to be happy, it will still be possible to live a happy and joyful life.
Truth of philosophy is of a merely theoretical value unless it can be lived, and we have therefore tried in The Synthesis of Yoga to arrive at a synthetical view of the principles and methods of the various lines of spiritual self-discipline and the way in which they can lead to an integral divine life in the human existence.
Sri Aurobindo (The Synthesis of Yoga)
”When you discipline yourself to do what is hard, you gain access to a realm of results that are denied everyone else. The willingness to do what is difficult is like having a key to a special private treasure room.
More than those who hate you, more than all your enemies, an undisciplined mind does greater harm.