Contradiction with 2 Samuel 7:15
This verse speaks of God's mercy not departing from David's line, which complements rather than contradicts the everlasting covenant in Isaiah 55:3.
2 Samuel 7:15: But my mercy shall not depart away from him, as I took [it] from Saul, whom I put away before thee.
Contradiction with Hebrews 8:13
Discusses a new covenant making the first obsolete, contrasting the enduring covenant mentioned in Isaiah 55:3 with the concept of a new covenant superseding the old.
Hebrews 8:13: In that he saith, A new [covenant], he hath made the first old. Now that which decayeth and waxeth old [is] ready to vanish away.
Contradiction with Galatians 3:16-18
Speaks about promises made to Abraham and his seed, which can be seen as prioritizing a different covenantal promise compared to the focus on David in Isaiah 55:3.
Galatians 3:16-18: Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And to thy seed, which is Christ.
Contradiction with Psalm 89:38-39
Describes God rejecting and being angry with His anointed, which contrasts with the idea of the "sure mercies" promised in Isaiah 55:3.
Psalm 89:38-39: But thou hast cast off and abhorred, thou hast been wroth with thine anointed.
Paradox #1
Isaiah 55:3 focuses on God's promise and covenant, emphasizing mercy and steadfast love. Some people might find a contradiction if they compare this promise of love and mercy with other parts of the Old Testament, where God is depicted as punishing people. They might see an inconsistency between the ideas of mercy and wrath.