Romans – Chapter Four XXVIII
“and being fully convinced that what He had promised He was also able to perform” (Romans 4:21).
Paul the Apostle highlighted Abraham’s unwavering faith in God by stating that, “…He was fully convinced that God was able to do what he promised” (CEB). Paul also turned to Abraham’s example to illustrate the nature of genuine faith in his Biblical letter to the churches of Galatia…
“The Scriptures say that God accepted Abraham because Abraham had faith. And so, you should understand that everyone who has faith is a child of Abraham. Long ago the Scriptures said God would accept the Gentiles because of their faith. This is why God told Abraham the good news that all nations would be blessed because of him. This means everyone who has faith will share in the blessings given to Abraham because of his faith” (Galatians 3:6-9 CEV).
One commentary provides us with a helpful perspective on these passages…
“Abraham did not know how God would fulfill His word, but that was incidental. He knew God and had every confidence that God was fully able to do what He had promised. In one way it was wonderful faith, but in another way it was the most reasonable thing to do, because God’s word is the surest thing in the universe, and for Abraham there was no risk in believing it!” (1)
This leads us to a timeless piece of wisdom that reminds us of the value of a promise: a promise is only as good as the person who makes it. The truth of that adage is undeniable, for we will inevitably encounter others who fail to deliver on their promises. However, we can rely on God’s promises, even when our external circumstances seem to suggest otherwise. To understand why, let’s consider the following attributes of God…
- God is immortal (1 Timothy 6:16).
- God is all-powerful (Genesis 1:1, Matthew 19:26).
- God is omnipresent (Psalm 139:7–12).
- God is omniscient (Psalm 139:1–4, Hebrews 4:13).
- God is immutable (or unchanging) (Malachi 3:6, James 1:17).
- God is just (Psalm 89:14)
- God is a God of truth (Deuteronomy 32:4, John 14:6).
- God is righteous (Psalm 11:7, Psalm 145:17).
While there may be some who lack the desire or ability to fulfill their promises, God is fully capable of fulfilling any promise He chooses to make. The following source addresses that reality with a comment worth considering: “Certain nouns and verbs are used in the New Testament according to Hebrew idiom. ‘Able,’ when applied to God or Christ, denotes both willingness and ability.” (2)
(1) William Macdonald, Believer’s Bible Commentary Edited by Arthur Farstad. Thomas Nelson Publishers [Romans 4:21]
(2) Smith, J. H. (2016). Romans 4:21. In The Ultimate Cross-Reference Treasury. Retrieved March 3, 2026.

In a sense, Abraham had to weigh two pieces of testimony. One piece of testimony involved his advanced physical age and that of his wife. That placed them well beyond their normal childbearing years. The other piece of testimony was offered by the all-powerful God who
These concepts reflect serious errors. For example, Genesis chapter one does not function as a model we can follow to “speak things into existence.” In addition, the context of Romans 4:17 precludes us from using this portion of Scripture as a license to call something into existence that previously did not exist. As the wise old rule of Biblical interpretation tells us, “If a Biblical passage makes good sense, we should accept it as it is, lest we end with nonsense.”
the Apostle often wove parenthetical statements into his Biblical epistles. This refers to a word, phrase, or qualification that adds supplementary information to a message. As the name suggests, a parenthetical statement is typically bracketed in parentheses whenever it occurs within a written work.
This brings us to the word “transgression” that appears within this passage. Though seldom used today, this word denotes an important Biblical concept. A “transgression” refers to a deliberate or willful act of misconduct. In other words, a transgression occurs whenever someone deliberately and purposely acts in violation of a known ordinance or law. Another commentary offers a definition of this word that expands on these meanings…