Once have I sworn - I have made one determination on this head, and have bound myself by my holiness; it is impossible that I should change, and there needs no second oath, the one already made is of endless obligation.

once

Psalm 110:4 The LORD has sworn, and will not repent, You are a priest for ever after the order of Melchizedek.

Psalm 132:11 The LORD has sworn in truth to David; he will not turn from it; Of the fruit of your body will I set on your throne.

Amos 4:2 The Lord GOD has sworn by his holiness, that, see, the days shall come on you, that he will take you away with hooks...

Amos 8:7 The LORD has sworn by the excellency of Jacob, Surely I will never forget any of their works.

Hebrews 6:13,17 For when God made promise to Abraham, because he could swear by no greater, he swore by himself...

that I will not lie. Heb. If I lie

2 Thessalonians 2:13 But we are bound to give thanks always to God for you, brothers beloved of the Lord...

Titus 1:2 In hope of eternal life, which God, that cannot lie, promised before the world began;

The People's Christ
We do not believe that Israel or Judah ever had a better ruler than David; and we are bold to affirm that the reign of the man "chosen out of the people" outshines in glory the reigns of high-bred emperors, and princes with the blood of a score of kings running in their veins. Yea, more, we will assert that the humility of his birth and education, so far from making him incompetent to rule, rendered him, in a great degree, more fit for his office, and able to discharge its mighty duties. He could …
Charles Haddon Spurgeon—Spurgeon's Sermons Volume 1: 1855

Atonement.
We come now to the consideration of a very important feature of the moral government of God; namely, the atonement. In discussing this subject, I will-- I. Call attention to several well-established principles of government. 1. We have already seen that moral law is not founded in the mere arbitrary will of God or of any other being, but that it has its foundation in the nature and relations of moral agents, that it is that rule of action or of willing which is imposed on them by the law of their …
Charles Grandison Finney—Systematic Theology

Second Sunday in Lent
Text: First Thessalonians 4, 1-7. 1 Finally then, brethren, we beseech and exhort you in the Lord Jesus, that, as ye received of us how ye ought to walk and to please God, even as ye do walk,--that ye abound more and more. 2 For ye know what charge we gave you through the Lord Jesus. 3 For this is the will of God, even your sanctification, that ye abstain from fornication; 4 that each one of you know how to possess himself of his own vessel in sanctification and honor, 5 not in the passion of lust, …
Martin Luther—Epistle Sermons, Vol. II