"Therefore, holy brethren, partakers of the heavenly calling, consider the Apostle and High Priest of our confession, Christ Jesus, who was faithful to Him who appointed Him, as Moses also was faithful in all His house."
Remaining faithful over the long haul is not an easy thing to do. Most people that venture off on their Christian journeys, eventually end up giving up the fight. The key to faithfulness is never found within us--but always and only in the Object of the true disciple's love and devotion: the Lord Jesus Christ.
This was why Moses was able to persevere to the end--because he never lost sight of Christ. Is Jesus your "Apostle," the One who fulfilled the mission of redemption? Is He your "High Priest," the One whose atonement cleanses you? If so, then you will, by grace, remain faithful. But this is all of God's sovereign doing. He gets the glory.
[Puritan quote of the day: "The remembrance of past goodness is very helpful for present encouragement. This rule David followed in Ps. 42:6: 'O my God, my soul is cast down within me; therefore will I remember Thee from the land of Jordan.' " --Christopher Love, in "The Dejected Soul's Cure"]