To reduce the imagination to a state of slavery --even though it would mean the elimination of what is commonly called happiness --is to betray all sense of absolute justice within oneself. Imagination alone offers me some intimation of what can be.
True happiness emanates from nothing/nowhere else but from/by deciding/refusing never to be worried about your anxieties/lacks/needs/deficiencies. And then, resolving wholly to cast all your anxieties/lacks/needs/deficiencies upon God who has long said/promised to carry/take care of all your anxieties/needs/lacks/deficiencies scripture reference (1st Peter 5 : 7).
True happiness is of a retired nature, and an enemy to pomp and noise it arises, in the first place, from the enjoyment of one's self, and in the next from the friendship and conversation of a few select companions.
Try to keep your soul young and quivering right up to old age, and to imagine right up to the brink of death that life is only beginning. I think that is the only way to keep adding to one's talent, to one's affections, and one's inner happiness.