In order to be sincere you must let go of being judgmental toward yourself. Being judgmental covers over your access to true sincerity and at times even masquerades as sincerity. True sincerity reveals a powerful form of clarity and discernment that is necessary in order to perceive yourself honestly without flinching or being held captive by your conditioned mind’s judgments and defensiveness.
The capacity and willingness to be honest with yourself is your greatest guard against self-deception and deceit, and aligns you with your genuine aspiration.
There is no greater challenge for a human being than to be completely honest with oneself as well as with others, and yet such honesty is absolutely necessary if we are ever to awaken from our dream of separation and live a truly genuine and undivided life.