Psalm 121: I lift up my eyes to the hills. From where does my help come? 2 My help comes from the Lord, who made heaven and earth. 3 He will not let your foot be moved; he who keeps you will not slumber. 4 Behold, he who keeps Israel will neither slumber nor sleep.
Later, in one of his talks, Jesus said to the people, "I am the Light of the world. So if you follow me, you won't be stumbling through the darkness, for living light will flood your path." -- John 8:12 (TLB)