There are people who go about declaring that there is no God, because they are not able to see Him. They say that they have searched in space, on the way to the moon, and even on the moon but there was no sign of the Almighty. Can you, do you assert, that there are no roots for trees, that nothing feeds them or upholds them, from below? God feeds, sustains, holds firm--unseen. He can be seen by those who make the effort, along the lines laid down for the purpose, by those who have succeeded in experiencing Him. God is, as butter in milk, visible when concretised by sadhana (spiritual striving).

God is the great Unseen, the vast Unknowable. Though you do not see the roots or know how far or how wide or deep they are clutching the earth, you pour water round that trunk, so that it may reach them, is it not? You expect that when the roots contact the water, the tree will yield fruit. (SSS Vol.11)

Shed tears of ananda (divine happiness), not tears of grief. Yearn for the Love that will bring you the Love of God, Prema. Love and serve; that is the Sadhana (spiritual striving) that will reward you best. (SSS Vol.11)

True sadhana(spiritual striving) consists in turning the tongue towards the mind, the mind towards the intellect and the intellect towards the Atma. While this royal road is available to man, he chooses to immerse himself in worldly pleasures and gets submerged in sorrow. (SSS Vol.23)

Mere formal worship or ritualistic practices do not constitute spiritual striving. These religious practices are good in a way. But they do not constitute spiritual sadhana. True spirituality consists in the unity of thought, word and deed in all their purity and sacredness. (SSS Vol.31)

The meaning of spiritual striving should be properly understood. Essentially spiritual striving calls for the shedding of all bad qualities and the cultivation of good thoughts. Spiritual sadhana means cultivating good thoughts and undertaking good deeds.  (SSS Vol.31)