To really understand? God it is helpful to understand his complex emotional life. This paragraph from John Piper has been of immeasurable help to me:
God’s emotional life is infinitely complex beyond our ability to fully comprehend. For example, who can comprehend that the Lord hears in one moment of time the prayers of 10 million Christians around the world, and sympathizes with each one personally and individually as a caring Father (as Hebrews 4:15 says), even though among those 10 million prayers some are broken-hearted and some are bursting with joy? How can God weep with those who weep and rejoice with those who rejoice when they are both coming to him at the same time–in fact are always coming to him with no break at all? Or who can comprehend that God is angry at the sin of the world every day (Psalm 7:11), and yet every day, every moment, he is rejoicing with tremendous joy because somewhere in the world a sinner is repenting (Luke 15:7, 10, 23)? Who can comprehend that God continually burns with hot anger at the rebellion of the wicked and grieves over the unholy speech of his people (Ephesians 4:29-30), yet takes pleasure in them daily (Psalm 149:4), and ceaselessly makes merry over penitent prodigals who come home? Who of us could dare say what complex of emotions is not possible for God? All we have to go on here is what he has chosen to tell us in the Bible. And what he has told us is that there is a sense in which he does not experience pleasure in the judgment of the wicked, and there is a sense in which he does. (The Pleasures of God, p.66)
Often it will be good to help God’s people understand all of God’s range of emotions. It will prevent them from falling off the ledge into heresy or confusion.