Within the 8 limbs of Yoga, lies Yama (abstinence) and within the Yamas, is Satya or truthfulness, without lies. It can also be defined as awareness of True Self. Awareness of God. An honesty to be who you truly are while at the same time adapting, accepting, and accommodating for growth. Not wearing different masks, one for family, one for work, another for friends... just being You, uniquely You and dissolving those masks.
Satya Pratisthayam Kriya Phalasrayatvam
When an individual is established in truth and can create karmic joy and good deeds for himself and others.
Yoga Sutra 2.36