Incredible Wisdom of Bharat!

सान्तःकरणा बुद्धिः सर्वं विषयमवगाहते यस्मात्। तस्मात् त्रिविधं करणं द्वारि द्वाराणि शेषाणि ॥३५॥

Intelligence along with other internal instruments comprehends all the subjects as it is fed. So, the three types of instruments are like main gates to the rest of the remaining gates.

The intellect, the ego and the mind are the three instruments that are the main gates.

ॐ असतो मा सद्गमय। तमसो मा ज्योतिर्गमय। मृत्योर्माऽमृतं गमय। ॐ शान्ति: शान्ति: शान्ति: ॥ - बृहदारण्यकोपनिषद् 1.3.28
"Ōm! Lead me from the unreal to the real, from darkness to light, and from death to immortality. Let there be peace, peace, and peace. Ōm!" - Brihadaranyaka Upanishad 1.3.28

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