The Hebrews had to be reminded in the strongest of terms that the just shall live by faith, and that God was not pleased with those who turned and ran in the day of battle. We do not want to allow ourselves to get in that fix. Nor do we want to become discouraged, thinking we will never measure up to what God requires of us and think, "This task is too hard."
Jesus, indeed, warned that the way is narrow and difficult, but it is not impossible because God has promised never to give us something that is too hard for us. God plays the game, as it were, according to the abilities of each individual. Though there is a standard against which everyone is judged, everyone is judged fairly—according to their natural ability and according to the gifts that God has given to them. Also, "to whom much is given, from him much will be required" (Luke 12:48).
So no one can look at his neighbor and compare himself with him, because no one knows exactly where the other person stands. There has to be some tolerance of and patience with one another. We must have an attitude of forgiveness, even of encouragement. We have to do whatever we can that might help the other person make it into the Kingdom of God. That is part of our responsibility.
Besides the fact that we know those things, there is also the "great cloud of witnesses" that is mentioned in Hebrews 12:1. That is, those who have gone before and are witnesses to us that God is faithful. How are they witnesses? They finished the race, and are awaiting the resurrection! God has given us witness of their lives, and how and why they made it. This witness illustrates His involvement in their lives.
He has recorded those things so that we can understand that God will deal with us in a merciful way. He has not called us to lose us but to save us. He is able to do what He sets His hand to do. We are in good hands—the best! We are in the most secure position that we could possibly be. That "great cloud of witnesses" witnesses to us that, if they did it, we can do it too.
So there is no need to get discouraged, even though the way for each of us is just as hard, just as difficult, as it has to be. He tells us in His Word that He will do far more—over and above what we can even begin to think that He is capable of doing—to ensure that we will be saved.