The quality of clarity, balance and light, in the Sanskrit reckoning of the three qualities. Not goodness as reward but as a settled state.
Sanskrit sattva (being, essence, purity), from sat (that which is, the true); one of the three gunas said to run through all matter and mind, naming clarity, balance and light rather than a moral goodness that must be earned.
The quality of clarity and settled balance, named by the Sanskrit reckoning of the mind's three qualities — a steady state rather than a reward for good behaviour.