Satya means truth. Talking truth & should not resort to lie talking. It may be verbal, written or by gestures. One should talk clear, truthful but at the same time sweet.

Again it is difficult to put in practice. While talking truth it should not create any bitterness. It may happen that truth talking may create problem, in such case one should keep mum, silent.

Fruit of true talking is yogee or sadhaka becomes VACHASIDDHA. It means what so ever such person says or talks becomes materialized.