One hope no sooner dies in us ...

One hope no sooner dies in us but another rises up in its stead. We are apt to fancy that we shall be happy and satisfied if we possess ourselves of such and such particular enjoyments; but either by reason of their emptiness, or the natural inquietude of the mind, we have no sooner gained one point, but we extend our hopes to another. We still find new inviting scenes and landscapes lying behind those which at a distance terminated our view.
One hope no sooner dies in us but another rises up in its stead. We are apt to fancy that we shall be happy and satisfied if we possess ourselves of such and such particular enjoyments; but either by reason of their emptiness, or the natural inquietude of the mind, we have no sooner gained one point, but we extend our hopes to another. We still find new inviting scenes and landscapes lying behind those which at a distance terminated our view.

Quotes from the same author

True happiness arises, in the first place, from the enjoyment of oneself, and in the next, from the friendship and conversation of a few select companions.
He only is a great man who can neglect the applause of the multitude and enjoy himself independent of its favor.
Let freedom never perish in your hands.
Young men soon give, and soon forget, affronts; old age is slow in both.
An honest private man often grows cruel and abandoned when converted into an absolute prince. Give a man power of doing what he pleases with impunity, you extinguish his fear, and consequently overturn in him one of the great pillars of morality.