1 Kings 19:14 (NKJV)
And he said, "I have been very zealous for the Lord God of hosts; because the children of Israel have forsaken Your covenant, torn down Your altars, and killed Your prophets with the sword. I alone am left; and they seek to take my life." Then the Lord said to him:
1 Kings 19:18 (NKJV)
Yet I have reserved seven thousand in Israel, all whose knees have not bowed to Baal, and every mouth that has not kissed him.
Elijah was an incredible prophet of God. I love reading about all the things he did. I believe the world will see him again during the tribulation as one of the two witnesses. Here in these verses, Elijah was alone and was being sought by wicked Jezebel to be killed. God comforts Elijah during his distress and asks him what the matter is. Elijah complains that he is the only one left. After giving Elijah some instructions on what to do next, God slips this bit of information in for Elijah's benefit that unbeknownst to Elijah, there are still 7,000 in Israel who are faithful to God. Elijah could not see from his perspective.
It's like that wonderful "Footsteps in the Sand" story. A man looked back on his life as two sets of footprints in the sand, one for him and the other for the Lord who was walking with him. Then he noticed that during the most difficult times of his walk through this life, that there were only one set of prints. He complained that God had abandoned him during this time. God gently corrected him and said that it was during those times that He was carrying him.
Faith is trusting in things we know to be true but that we cannot see.
Hebrews 11:6 (NKJV)
But without faith it is impossible to please Him, for he who comes to God must believe that He is, and that He is a rewarder of those who diligently seek Him.