Most of us only make small sacrifices, but some of us might be called upon to make greater sacrifices. In spite of the difficulties involved in being faithful, the Lord Jesus Christ does not leave us without hope. He gives us the greatest motivation to faithfulness. He promises us the crown of life. The reward is great and the sacrifices we are called upon the make, in comparison to the reward, are relatively small.
Faithfulness comes from faith.
Our faith in Jesus Christ is the ground upon which our faithfulness to Him is possible. We walk by faith, not by sight. This is the example left to us in the Bible by the early Christians. They did walk by faith and not by sight. Many of them also gave up their lives rather than be unfaithful to their Lord.