#yogasutrachallenge: When one is established in truthfulness, one ensures the fruition of actions - Book II Sutra 36
Here, Patanjali is interpreted as saying that to a completely truthful person, things come automatically. Eventually, not only do you speak the truth, but actually everything you say becomes true. You say you will become a great yogi and it will be so!
Achieving complete truthfulness is a tall order. It often requires courage and wisdom to see the truth in the first place, and even more of these qualities to act and speak truthfully in turn. For many of us the white lies we tell on a daily basis are an incredible challenge to overcome. But the great yogis believe with the establishment of complete honesty, so comes great fearlessness, and most others will come to trust and respect you for it.