The eternal character of happiness and our short-lived and vain pursuits

The Imitation of Christ says under "Man Must Not Be Immersed in Business" (paraphrased) that when one has obtained some pursuit, even one pursued with great enthusiasm, he/she would subsequently lose interest, since the affections towards the object of desire is not lasting. Perhaps it is in our nature, being finite beings, to flit from one thing to another. This is more true today than it ever was, in prosperous societies where people can afford a great many toys, games, and entertainments. But I note how frivolous it seems to jump at each new "thing"! What happens when no new thing can be found? What if the next new thing is unaffordable? The happiest seem to be those who find something with a lasting character: love, family, a home, a long and stable career. There is no flitting about this way or that. The less temporary the source or object of happiness, the greater the satisfaction, I think. That probably can't be found in a gadget or toy store! I know I have it in my family, much of whom shall simply outlive me, so that is where I should invest my pursuits. It is not a huge family, but counting extended family, my parish, and the entire people of God, that is a huge family. That I have them should fill me with contentment and gratitude!