Contradiction with Psalm 34:19
Isaiah 30:20 mentions the Lord providing adversity and affliction, whereas Psalm 34:19 assures that the Lord delivers the righteous from afflictions.
Psalm 34:19: Many [are] the afflictions of the righteous: but the LORD delivereth him out of them all.
Contradiction with Psalm 91:10
Isaiah 30:20 implies the inevitability of adversity, while Psalm 91:10 promises that no evil will befall those who trust in God.
Psalm 91:10: There shall no evil befall thee, neither shall any plague come nigh thy dwelling.
Contradiction with James 1:2-3
Isaiah 30:20 suggests that adversity is given by God as a teacher, whereas James 1:2-3 speaks of trials as a source of joy and testing of faith, not a direct provision from God.
James 1:2-3: My brethren, count it all joy when ye fall into divers temptations; [temptations: or, trials]
Contradiction with Romans 8:28
Isaiah 30:20 focuses on receiving adversity, while Romans 8:28 emphasizes that all things work together for good, not necessarily through affliction.
Romans 8:28: And we know that all things work together for good to them that love God, to them who are the called according to [his] purpose.
Contradiction with 1 Peter 5:10
Isaiah 30:20 speaks of receiving adversity, yet 1 Peter 5:10 conveys that after suffering, God will restore and strengthen the believers.
1 Peter 5:10: But the God of all grace, who hath called us unto his eternal glory by Christ Jesus, after that ye have suffered a while, make you perfect, stablish, strengthen, settle [you].