John 12:35

So Jesus said to them, “The Light is among you (only) a little while longer. Walk while you have the Light (keep on living by it), so that darkness will not overtake you. He who walks in the darkness does not know where he is going (he is drifting aimlessly).

The increase of sin and darkness in the world and around us can cause us to become fatigued. Jesus is still here with the light, and we need to keep walking in it. We must keep the faith, focus on the promise, and have more faith in the Creator instead of the creation. If we do that, the darkness will not overtake us.