Rta is the cosmic
order and regularity that allows the rhythms of time and seasons to occur in
orderly succession, according to the Vedas (the oldest and most authoritative
Hindu texts).
According to the texts, rta had a moral dimension to it,
which humans were obligated to support.
One such moral dimension was truth, which was seen as
upholding the cosmos, while its polar opposite, anrta, came to be associated
with deception.
Varuna, the Vedic god who was both the guardian of rta and
the deity who punished untruth, usually by affliction with dropsy, was the link
between the natural and moral worlds.
You may also want to read more about Hinduism here.
Be sure to check out my writings on religion here.