Contradiction with John 16:33
Isaiah 41:5 speaks about fear of the coastlands, while John 16:33 assures peace in Christ despite tribulations.
John 16:33: These things I have spoken unto you, that in me ye might have peace. In the world ye shall have tribulation: but be of good cheer; I have overcome the world.
Contradiction with 2 Timothy 1:7
Isaiah 41:5 mentions fear, whereas 2 Timothy 1:7 says God has not given us a spirit of fear.
2 Timothy 1:7: For God hath not given us the spirit of fear; but of power, and of love, and of a sound mind.
Contradiction with 1 John 4:18
Isaiah 41:5 discusses fear, but 1 John 4:18 states that perfect love casts out fear.
1 John 4:18: There is no fear in love; but perfect love casteth out fear: because fear hath torment. He that feareth is not made perfect in love.
Contradiction with Psalm 23:4
Isaiah 41:5 implies fear, while Psalm 23:4 expresses fearlessness even in the valley of the shadow of death.
Psalm 23:4: Yea, though I walk through the valley of the shadow of death, I will fear no evil: for thou [art] with me; thy rod and thy staff they comfort me.
Contradiction with Romans 8:31
Isaiah 41:5 refers to fear of peoples, but Romans 8:31 declares that if God is for us, no one can be against us.
Romans 8:31: What shall we then say to these things? If God [be] for us, who [can be] against us?