All these disciplines are for the purification of the heart. And as soon as it is pure, all truths flash upon it in a minute; all truth in the universe will manifest in your heart, if you are sufficiently pure.
It is quite an old-fashioned fallacy to suppose that our objection to scepticism is that it removes the discipline from life. Our objection to scepticism is that it removes the motive power. Materialism is not a thing which destroys mere restraint. Materialism itself is the great restraint.
When the leader is morally weak and his discipline not strict, when his instructions and guidance are not enlightened, when there are no consistent rules, neighboring rulers will take advantage of this.
Self-discipline, although difficult, and not always easy while combating
negative emotions, should be a defensive measure. At least we will be able to prevent the advent of negative conduct dominated by negative emotion. That is 'shila', or moral ethics. Once we develop this by familiarizing ourselves with it, along with mindfulness and conscientiousness, eventually that pattern and way of life will become a part of our own life.
It has been said that the great scientific disciplines are examples of giants standing on the shoulders of other giants. It has also been said that the software industry is an example of midgets standing on the toes of other midgets.
What is the next step, the practical application? —I will answer that the absolutely vital thing is to consolidate your understanding, to become capable of enjoyment, of living in the present, and of the discipline which this involves. Without this you have nothing to give.
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.
Well, let's distinguish religion from spirituality. I am Catholic, so religion for me is a way of having discipline and collective worship with persons who share the same mystery.