Proverbs 13:12 (b) When the heart is depressed and discouraged, it is represented as being ill. It fails to function as it should, and is deeply affected by adversity.
Song of Solomon 2:5 (b) The wise man is telling us by this expression that his whole soul and being is given up to love and loving, so that nothing else in the world matters. It makes him unfit for any other occupation. (See also Song of Solomon 5:8).
Isaiah 1:5 (a) The Lord is thus describing that which He sees in the minds and thoughts of Israel. They were only evil and wicked continually. Their minds were occupied with rebellion and idolatry, with lust and sin.