The text of our every day meditation is the Gayatri, a verse which is considered to be the epitome of all the Vedas. By its help we try to realize the essential unity of the world with the conscious soul of man; we learn to perceive the unity held together by the one Eternal Spirit, whose power creates the earth, the sky, and the stars, and at the same time irradiates our minds with the light of a consciousness that moves and exists in unbroken continuity with the outer world…
To be truly united in knowledge, love and service with all beings, and thus to realize one’s self in all pervading God is the essence of goodness, and this is the keynote of the teachings of the Upanishads: Life is immense. (Rabindranath Tagore)
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Swayambhu Manu states
There is no higher mantra than Gayatri, there is no higher deity than one’s mother.
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Savita is the main deity addressed in Gayatri Mantra. According to Taittiriya Upanishad, this Savita is the impeller, the driving force behind the cosmos through whose force the wind blows, through whose force the Sun moves, and through whose force Agni and Indra discharge their functions. The outer sun that we see is only a mere physical vehicle of a mighty and all-knowing consciousness which pervades the solar system in layers of inexpressible glory. Further, the man and the spiritual Sun hidden behind the physical Sun are one. This Spiritual Sun's consciousness is the Savita whose blessings are invoked in Gayatri Mantra.
Source – Gayatri mantra by S Viraswami Pathar