One gets drained because one is expending much more energy not commensurate with the receptivity.
At the Feet of The Mother
Essays on Yoga
She surely knows us much better than we do ourselves, otherwise She would not be who She is.
The necessity of personal effort in sadhana diminishes as we progress in surrender and the Divine Mother takes charge of our life and breath and speech and act. Then it is She who does the sadhana in us and all that is needed is to remain open towards Her.
A machine is unconscious and hence its perfection is limited, a man is half-conscious with the possibility of collaborating in the evolutionary process and becoming fully conscious.
This is the great difference between the Hindu approach, almost inbuilt in the Hindu DNA, and major world religions where things began and ended with one founder and one book.
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In the end, Death too is a mask that the Eternal has assumed to serve as a goad towards Immortality.
It is not easy to know that since the Divine Will is hidden behind many layers and often muffled through many voices and noises within us.
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The idea of Kalki Avatar is straight from the Vishnu Purana considered as few of the authentic Puranas rich in occult significance.
This issue has multiple aspects which are difficult to address in a brief essay, but we can outline a few possible causes and approaches.