Sadhak = one who follows a yogic discipline.
Sadhana = yogic discipline.
Yoga = union with the Divine (by extension: the path which leads to this union).
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This has nothing to do with a spiritual life, not even with religion. X will explain to you in detail, but I can tell you that Yoga is not only an aspiration of the mind towards the Divine but also and chiefly a yearning of the heart.
6 November 1963
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The whole world is in a process of progressive transformation; if you take up the discipline of Yoga, you speed up in yourself the process.
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Yoga is commensurate with all life.
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True spirituality transforms life.