Here is an affirmation to focus on Patanjali's second yama from the eight limbs of yoga:
"I live in truth. I speak the truth to myself and to others (when appropriate). When offering my truth in the form of feedback I am sensitive to the feelings of others; I speak in the spirit of love. I also take responsibility for my actions. I do not blame anyone for my experience; I honestly see my own part in every situation."
When practicing the second Yama, we need to remember the first: Ahimsa (non-violence/compassion). If we speak our truth in a way that is mean, we are not making our best efforts on the path. So we need to find a way for Satya and Ahimsa to coexist. Let us be reminded of the affirmation for Ahimsa:
"My thoughts and actions are focused on loving awareness. I nurture and cherish myself and others. I am aware that the mind sometimes entertains thoughts of fear, anger, or selfishness but I do not get caught in these thoughts or act upon them. I accept without judgement any uncomfortable mental states. I release them and return to gently, non-violent expression of my energy."
When we want to speak, we can consider the following sentiments before we do:
"Is it true? Is it kind? Is it necessary?" -- Sufi saying
"Most people will not remember what you said or what you did. But they will remember how you made them feel." -- Maya Angelou
"If in doubt whether to observe Ahimsa or Satya, always go with Ahimsa." --Swami Vivekananda