Updated below.
Affections? Yes. Passions? No.
I recommend Kevin DeYoung’s breakout session lecture on the impassibility of God given at this year’s Together for the Gospel Conference: Tis Mystery All, the Immortal Dies: Why the Gospel of Christ’s Suffering is More Glorious Because God Does Not Suffer. (I hope the link will work for you. If not, try it later. The whole T4G site has been behaving badly for the last day or so.)
Doesn’t that sound like a good Puritan title? And like a good Puritan sermon, listening to this session requires that you use your thinking cap. Here are two resources to help you keep focused:
One What, Three Whos
No, the Trinity is not like an egg, or a three-leafed clover, or ice, water, and steam. It’s not like this either. (Sacred Sandwich)
Update, May 15: Same Premise, Same Arguments, Same Denial
“The open theists hold to a particular version of free will (libertarianism), a view that they consider to be incompatible not merely with foreordination but also with foreknowledge. The Socinians held to the same beliefs around four hundred years ago. Open theism found significant historic precedent in the Socinian remodification of God’s prescience.” (Quoted from Denying exhaustive omniscience: Open theists and Socinians at Against Heresies.)