How about the expression, true colours? When a person is put into a difficult situation, we sometimes remark that we've seen their true colours. It must relate to a reality that many people are masked, at least partially. At the point of tension, one's mask is difficult to maintain and the truth is revealed. Generally, the true colours are different than their mask.
Wearing a mask? What are your true colours? The Bible says that God made you for truth and rightness. It might actually be that you have yet to recognise your true colours, that is the truth of why you're here. Seeking God will bring you closer to your true colours.
Psalm 15:2 (NIV)
2 He whose walk is blameless and who does what is righteous, who speaks the truth from his heart