In plain words
merely discovered them; the doubt as to why an event occurring in one place did not occur in another place is a distorted notion. Whatever is to occur, when, and where, only its own doer can determine — it happens according to that determination.
The atmosphere of Bharatakhaṇḍa was favorable for the Vedas' arising and flourishing. Because ṛṣis devoted to action, and yogis, were born in Bharatakhaṇḍa, which is the land of action, the land of yoga, and the land of sacrifice, the Veda was drawn to precisely the hearts of such people. Since other lands are lands of pleasure, and the worldly atmosphere runs riot excessively in those lands, other continents cannot easily understand this Vedic word. The land of Bhārata is one that holds the worldly together with the other-worldly. Therefore, as if it were Bharatiyas' good fortune, the Veda-mother took incarnation in the land of Bhārata and became manifest.
That it did not become manifest there does not mean the Veda-mother is not present in other countries — that is not valid. Just as gravity exists in the earth of every country, the Vedic word exists in every continent as well. The Veda is all-pervading. The great ṛṣis who are within the land of Bharat were able to receive that sacred śruti with their own power of austerity and concentration. They were able to see that form of sound, and experience it. They — that is, the great ṛṣis — being free of self-interest and Prema by their very nature, kept giving what they themselves had heard and experienced, desiring the welfare of others, having safeguarded the essence of the Veda, to those who came close to them, each in his own turn. Therefore, the great ṛṣis who imparted it were called mantra-draṣṭas. Through them, by a succession of disciples, from age to age, this Vedic voice spread through the land. It flowed in every direction like an endless stream. They made manifest this imperceptible, unmanifest Veda. Therefore, Bharatiyas came to know that the ṛṣis alone are the draṣṭas of the Veda.