Contradiction with Matthew 6:19-20
Matthew 6:19-20 advises against storing treasures on earth, focusing instead on heavenly rewards, which contrasts with the notion of receiving manifold more in the present time as suggested in Luke 18:30.
Matthew 6:19-20: Lay not up for yourselves treasures upon earth, where moth and rust doth corrupt, and where thieves break through and steal:
Contradiction with 1 Timothy 6:8-9
1 Timothy 6:8-9 warns about the desire for material wealth, indicating potential pitfalls, contradicting the promise of manifold returns in this life as mentioned in Luke 18:30.
1 Timothy 6:8-9: And having food and raiment let us be therewith content.
Contradiction with Hebrews 11:13
Hebrews 11:13 speaks of people who lived by faith but did not receive the promises during their lifetime, contradicting the assurance of present rewards in Luke 18:30.
Hebrews 11:13: These all died in faith, not having received the promises, but having seen them afar off, and were persuaded of [them], and embraced [them], and confessed that they were strangers and pilgrims on the earth. [in faith: Gr. according to faith]
Contradiction with Matthew 19:21
Matthew 19:21 advises selling possessions and giving to the poor, promising treasure in heaven without mention of earthly gain, which contrasts with the promise of earthly compensation in Luke 18:30.
Matthew 19:21: Jesus said unto him, If thou wilt be perfect, go [and] sell that thou hast, and give to the poor, and thou shalt have treasure in heaven: and come [and] follow me.
Contradiction with James 4:4
James 4:4 warns against friendship with the world and suggests that seeking worldly gain might stand contrary to the spiritual focus implied by the rewards mentioned in Luke 18:30.
James 4:4: Ye adulterers and adulteresses, know ye not that the friendship of the world is enmity with God? whosoever therefore will be a friend of the world is the enemy of God.