Guru Dev (Swami Brahmananda Saraswati) and Maharishi Mahesh Yogi
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Why Sanskrit is important
Sanskrit is important because it is the language o' Gop or God. It is the Language o' Nature, the Celestial Language, that o' the Divine.
At this time, one could consider every single Sanskrit word a mantra or magic word. Mantras like Prem, or love, are very important.
The English language is not intrinsically bad, per se, but obviously Sanskrit, being the ancient language o' Cosmic Existence, is superior.