The complete answer to that question is in the Summa...Thomas Aquinas explains those kinds of questions better than any of us can on this fourm

God does not get angry.

God cannot change, therefore any use of describing the workings of Providence (which are decreed from eternity) using human emotion or actions is merely for the sake of comparison.

Please reference Providence by Garrigou-Lagrange for the questions you have been having of late on God's nature. The first section of the book deals almost exclusively with what you have been asking so far. It is truly an eye-opener.

There is another book that you may want to reference to understand the nature of God - strangely, it is not Catholic. Please see the Tao Te Ching, generally attributed to Lao-tzu, for an introduction to the concept of “wu-wei”, which is translated as “non-action” or “non-ado” – my own translation is “non-becoming”. This may sound strange, but I have never read a more simple and accurate description of how Providence never changes and yet directs all things. True, there are many parts of the Tao Te Ching that are questionable and can be understood in many non-Catholic ways – however, having read Lao-tzu’s work prior to Garrigou-Lagrange, when I started reading Providence, each night I would come across a section that would make me smile with wonderment at how similar Catholic theology was to Lao-tzu’s belabored grasping and looking through a dark glass. One could say that Catholic ascetical theology is very similar to philosophical Taoism (there are those Sinologists that deny any separation of philosophical and religious Taoism, but that is another story).  

If you are willing to give Lao-tzu a try, John Wu (a convert to Catholicism) has the most readable translation. After that, if you have an affinity to the text, see Legge's translation and notes.