While most mantra has been created by man, the Gayatri Mantra is said to come from Brahma himself. The Gayatri mantra provides a relatively short path to self-realization.
Om bhur bhuvah swah
tat savitur varenyam
bhargo devasya dheemahi
dhiyo yonah prachodayat
ॐ भूर्भुवः स्वः
भर्गो देवस्य धीमहि
धियो यो नः प्रचोदयात् ॥
The eternal, earth, air, heaven
That glory, that resplendence of the sun
May we contemplate the brilliance of that light
May the sun inspire our minds.