The first quote tonight is a repeat from Elder Boyd K. Packer's thought from The Standard of Truth Has Been Erected.
The one by President Monson reminds me of Hymn 336, School Thy Feelings. Of course, the title of his talk is the first line of the hymn.
"We've all felt anger. It can come when things don't turn out the way we want. It might be a reaction to something which is said of us or to us. We may experience it when people don't behave the way we want them to behave. Perhaps it comes when we have to wait for something longer than we expected. We might feel angry when others can't see things from our perspective. There seem to be countless possible reasons for anger….If we desire to have a proper spirit with us at all times, we must choose to refrain from becoming angry."Anger is a secondary emotion. It is always caused by something first.
--Thomas S. Monson, "School Thy Feelings, O My Brother", Ensign, Nov 2009, 62, 67–69