Lamentations 3:22–23 says God's compassions are "new every morning." This is not a prescription for emotional consistency — it is a description of God's consistency when ours fails. The person with bipolar disorder experiences God not because their own emotional register is reliable but because God's character does not shift with their mood.
2 Corinthians 12:9 was spoken to Paul about a specific, persistent affliction he asked God to remove three times. God said no — and explained that his grace was sufficient precisely in that weakness. The weakness was not removed; the grace was given inside it. Professional psychiatric care for bipolar disorder, including medication, is stewardship of the body God gave you. It is not a sign of insufficient faith; it is the same care a diabetic takes insulin. Seeking treatment is consistent with honoring God with your mind and body.
Commentary is from a charismatic Protestant perspective, drawing on KJV text and public-domain sources including Spurgeon, Andrew Murray, and Matthew Henry.