The source

"Happiness is not quantitative or measurable, and it is not the object of any science, old or new. It cannot be gleaned from empirical surveys or programmed into individuals through a combination of behavioral therapy and antidepressants. If it consists in anything, I think that happiness is this feeling of existence, this sentiment of momentary self-sufficiency that is bound up with the experience of time Look again at what Rousseau writes. Floating in a boat in fine weather, lying down with one’s eyes open to the clouds and birds or closed in reverie, one does not feel the pull of the past, nor does one reach into the future. Time is nothing, or rather, time is nothing but the experience of the present through which one passes without hurry but without regret. As Wittgenstein writes in what must be the most intriguing remark in the Tractatus, “The eternal life is given to those who live in the present.” Or, as Whitman writes in Leaves of Grass: “Happiness is not in another place, but in this place . . . not for another hour . . . but this hour.” Rousseau asks, “What is the source of our happiness in such a state?” He answers that it is nothing external to us and nothing apart from our own existence. However frenetic our environment, such a feeling of existence can be achieved."
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Bald: 35 Philosophical Short Cuts" by Simon Critchley: https://a.co/8DX96aa