John 12:35-36

So Jesus said to them, You will have the Light only a little while longer. Walk while you have the Light [keep on living by it], so that darkness may not overtake and overcome you. He who walks about in the dark does not know where he goes [he is drifting]. While you have the Light, believe in the Light [have faith in it, hold to it, rely on it], that you may become sons of the Light and be filled with Light. Jesus said these things, and then He went away and hid Himself from them [was lost to their view].