If God can have feelings, then he can change from one state of emtions to another, therefore He can no longer be considered
immutable. This, of course, is manifestly false (cf.
St. Thomas Aquinas,
Compendium Theologiae, part I, chap. VIII).*
dhspriory.org/thomas/Compendium.htm#8
Emtions are in the sensitive appetite. God, however, has no sensitive appetite, therefore He cannot have emtions.
Emotions are had by beings that are in potentiality. God, however, is pure act, therefore He cannot have emotions.
See St. Thomas Aquinas’
Summa Contra Gentiles, book I, chap. 89-91.
www2.nd.edu/Departments/Maritain/etext/gc1_89.htm
“Hence it appears that of our affections there is none that can properly be in God except joy and love, though even these are in Him not by way of passion, as they are in us. … But even other affections (affectiones), which are specifically inconsistent with divine perfection, are predicated in Holy Writ of God, not properly but metaphorically, on account of likeness of effects” (
SCG, chap. 91).
*See also Dr. Ott,
Fundamentals of Catholic Dogma, which teaches: “God is absolutely immutable.” -
jloughnan.tripod.com/dogma.htm