You hit it right on the head for me, Wants2!! I heard the very same thing in church a long time ago and couldn't quite recall it to my satisfaction! Kudos and thanks to you!
Yes, "happiness" is dependent on "happenings" which are transient. But if you are Content with your life and yourself, then there's more room for good "happenings."
To me, Contentment and Settling are two different things. If I am Content, I'm at peace. I made this choice. If I Settle, then I'm giving up some of my choices. I always taught my kids to Not Settle but to go for their heart's desire.
There was a time that I was content. It was a Very Good, Comfortable feeling!
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.