Stewardship of the Gospel

Scope and Responsibility
For if I preach the gospel, that gives me no ground for boasting. For necessity is laid upon me. Woe to me if I do not preach the gospel! For if I do this of my own will, I have a reward, but if not of my own will, I am still entrusted with a stewardship. (1 Corinthians 9:16-17 ESV)
This is how one should regard us, as servants of Christ and stewards of the mysteries of God. (1 Corinthians 4:1 ESV)

Motivation
And said, Naked came I out of my mother's womb, and naked shall I return thither: the LORD gave, and the LORD hath taken away; blessed be the name of the LORD. (Job 1:21 KJV)
As he came from his mother's womb he shall go again, naked as he came, and shall take nothing for his toil that he may carry away in his hand. (Ecclesiastes 5:15 ESV)
For we brought nothing into this world, and it is certain we can carry nothing out. (1 Timothy 6:7 KJV)
Whatever you do, work at it with all your heart, as working for the Lord, not for human masters, since you know that you will receive an inheritance from the Lord as a reward. It is the Lord Christ you are serving. (Colossians 3:23-24 NIV)

Requirement
Moreover, it is required of stewards that they be found faithful. (1 Corinthians 4:2 ESV)
One who is faithful in a very little is also faithful in much, and one who is dishonest in a very little is also dishonest in much. If then you have not been faithful in the unrighteous wealth, who will entrust to you the true riches? (Luke 16:10-11 ESV)
For an overseer, as God's steward, must be above reproach. He must not be arrogant or quick-tempered or a drunkard or violent or greedy for gain, but hospitable, a lover of good, self-controlled, upright, holy, and disciplined. (Titus 1:7-8 ESV)