It prescribes Yoga Sadhana even for a scavenger or a cobbler to attain God-realization, while doing his ordinary avocation in the world. Religion is the practical aspect of philosophy. Philosophy is the rational aspect of religion. The philosophy of Hinduism is not armchair philosophy. It is not meant for intellectual curiosity and vain discussion.
Hindu philosophy is a way of life.
The Law of Karma is one of the fundamental doctrines of not only Hinduism, but also of Buddhism and Jainism. As a man sows, so shall he reap. This is the law of Karma. Desire produces Karma. You work and exert to acquire the objects of your desire.