The progressive growth of the finite consciousness of man towards this Self, towards the universal , the eternal, the infinite, in a word his growth into spiritual consciousness by the development of his ordinary ignorant natural being into an illumined divine nature, this is for Indian thinking the significance of life and the aim of human existance.
Thus to act under the guidance coming from above, this is one side of the sadhana, the dynamic side. The other one is the discrimination between the Purusha and the Prakriti. The Purusha will calmly observe, give sanction, choose, but will realise that all this does not belong to him - all these are outside him. This is the static side of the sadhana. These two aspects constitute the basis of Yoga.
A quiet mind does not mean that there will be no thoughts or mental movements at all, but that these will be on the surface, and you will feel your true being within, separate from them, observing but not carried away
The experiences of your past life which are stored within come up to the surface to be rejected. By rejecting all these by and by the inside will have to be cleansed.
Each religion has helped mankind. Paganism increased in man the light of beauty, the largeness and height of his life, his aim at a many-sided perfection; Christianity gave him some vision of divine love and charity; Buddhism has shown him a noble way to be wiser, gentler, purer, Judaism and Islam how to be religiously faithful in action and zealously devoted to God; Hinduism has opened to him the largest and profoundest spiritual possibilities.
The yoga we practice is not for ourselves alone, but for the Divine; its aim is to work out the will of the Divine in the world, to effect a spiritual transformation and to bring down a divine nature and a divine life into the mental, vital and physical nature and life of humanity. Its object is not personal Mukti, although Mukti is a necessary condition of the yoga, but the liberation and transformation of the human being. It is not personal Ananda, but the bringing down of the divine Ananda - Christ's kingdom of heaven, our Satyayuga - upon the earth.
All religions have some truth in them, but none has the whole truth; all are created in time and finally decline and perish. Mahomed himself never pretended that the Koran was the last message of God and there would be no other. God and Truth outlast these religions and manifest themselves anew in whatever way or form the Divine Wisdom chooses.