They went out from us, but they were not of us. For if they were of us, they would have continued with us, but--so that they might be made known, that they are not all of us.
Jesus therefore said to them, Yet a little time the light is with you. Walk while ye have the light, so that darkness may not overcome you. And he who walks in the darkness knows not where he is going.
Because, although knowing God, they did not glorify him as God, nor were they thankful, but became vain in their reasonings and their heart was darkened without understanding.