Traditionally, in Christian theology, God has been understood to be impassible. That is, God doesn’t suffer under the actions of anything/anyone completely apart from and outside of himself.
According to this technical usage of ‘passion’ and ‘impassibility’, when chocolate is brought before me I suffer a passion for it. That is, the chocolate acts upon me and I’m passive–the chocolate is an agent and I am a patient. I may choose to do what I want with my passion, but insofar as the chocolate really has acted upon me I have no choice in whether or not the passion is churned up in me. I am passive and the chocolate is active. In that sense I’m controlled by the chocolate.
The doctrine of the impassibility of God teaches that God can never be gripped and acted upon by an outside agent in this way. It doesn’t mean that God can’t passionately love or passionately feel sad. (I here use ‘passionate’ in the modern sense, meaning intense or fervent.) It does mean that God’s love and sadness are different, in an important way, from that of ours.
Consider Romans 9, 10 and 11. Here we find Paul, among other things, describing Israel’s betrayal of God and rejection of Christ. God is obviously understood to be very sad and otherwise upset about this. This not what God would prefer. It is not what he wants. He wants Israel to be faithful, and to receive Christ.
Does this unfaithfulness of Israel come from outside of God and grip him, acting upon him such that he suffers as a patient to an outside agent? In certain obviously sense, yes.
But in a deeper and more mysterious sense, no. Consider the last verse of chapter 11.
How unsearchable are his judgments and how inscrutable his ways!
“For who has known the mind of the Lord,
or who has been his counselor?”
“Or who has given a gift to him
that he might be repaid?”
For from him and through him and to him are all things. To him be glory forever. Amen.
Whatever else is included in the “all things” spoken of here, Israel’s unfaithfulness certainly is. Context makes this obvious. So we find that even this betrayal came from/through/to the Lord in some deep and mysterious sense.
Even that which breaks God’s heart is ultimately given life and sustained by God himself. In this sense God is never a pure patient to an outside agent. And so in this technical sense God is impassible.
See how this differs from my passion for chocolate? God, as God, relates to everything else in a fundamentally different way than I do. I, as a creature, relate to everything else (save God) as a fellow creature. God relates to everything as its creator and sustainer. God is the one in whom “we live and move and have our being”. That is why God is impassible. This is no handicap and it represents no coldness or aloofness in God.
It is rationalism which refuses to acknowledge this simply because it is incomprehensible. (It is, however, apprehensible.)