Contradiction with Philippians 4:13
It speaks of strength through Christ, while Psalms 42:6 mentions a soul cast down and troubled.
Philippians 4:13: I can do all things through Christ which strengtheneth me.
Contradiction with 2 Corinthians 12:10
It speaks of taking pleasure in infirmities for strength, whereas Psalms 42:6 reflects discouragement.
2 Corinthians 12:10: Therefore I take pleasure in infirmities, in reproaches, in necessities, in persecutions, in distresses for Christ's sake: for when I am weak, then am I strong.
Contradiction with John 16:33
It talks about peace and overcoming the world, contrasting with the turmoil expressed in Psalms 42:6.
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 James 1:2-3
This verse speaks of joy in trials, while Psalms 42:6 expresses sadness and despair.
James 1:2-3: My brethren, count it all joy when ye fall into divers temptations; [temptations: or, trials]