The Veda, the Sacred Knowledge, advances to all people throughout the universe via the principle of life and sensation, a breath from heaven, for a person to rise to heaven. The knowledge that spreads throughout the universe obviously spread throughout the earth. Unfortunately, such was many thousands of years ago when the Shining Ones graced the earth as shining examples of the Holy Teaching. They were people like us who listened to the Supreme Spirit pervading the universe and lived accordingly. They became enlightened and glowed with light and happily served the less fortunate upon the earth. The teaching was preserved via the Oral Tradition so an unbroken thread continued upon the earth until the lineage ended, at which time the text was carved or painted on walls or scribed on palm leaves for preservation. Although there is a claim by some of being enlightened, there has not been such a person upon the earth in over three thousand years yet the spiritual teaching to follow to become is available. The knowledge is preserved in all the ancient spiritual texts of the world, preserved in the texts of the Rigveda, Upanishads, Quran, Bible, and so on, yet not transmitted due to inept translations. Here is a mantra to give you the idea.
The first Angiras gained vital force for themselves, then the fire was ignited through good thoughts and deeds. Together they found happiness and the light by gathering the breath within, essential to liberate the bound soul to the Eternal Spirit pervading the universe.