Dont say you have no means of knowing if things are right inwardly, because you actually have a criterion by which to measure your inner state

"Do not say you have no means of knowing if things are right inwardly, because you actually have a criterion by which to measure your inner state, and this criterion is light. When you meditate or you are in a highly spiritual state, you can sometimes feel that everything in you becomes luminous, as if lamps had been lit, as if a sun were shining within. You even feel this light shining through your face, your hands, the whole of your body. Why? Because as soon as you elevate yourself towards the higher levels of goodness, generosity, gentleness and purity, light generates within you, you feel it, you see it and everything lights up. Whereas if you give in to lower states of consciousness, you do not even have to look in the mirror, you physically feel the darkness on your face. So, never forget the criterion of light."