Re this specific quote, Nietzsche seems to be saying that if you actually identify anything at all (eg a sense, or a thought etc) as real/important/having other similar positive meaning given to it, then it should follow that the prospect of finding (more/elaborated) meaning is real, because there cannot be just one instance of meaning isolated and all would actually be the foundation of that one idenified meaningful experience.
Which is a long-winded way of saying something along the lines of "if you have found some meaning, you have more than enough to dig into".
Nietzsche was never deep philosophy; he was locked in a fight against german religiousness, germans, and religiousness. He is mostly a writer of sociology, and literary critique theory. Important and intelligent, but not deep philosophy.
Eg, for a philosophical reply to that quote: there isn't anything to tell one that any identified such meaning is to be identified due to the object the meaning is attributed to, or due to the rest of the tied objects (as in the quote), instead of due to the human thinker having to identify meaning in set conditions, much like in parallel one would identify a triangle if set conditions are met. Only that in the case of the triangle those conditions are largely conscious (and fully conscious if just the general description) while in the case of a sense of meaning they are neither conscious nor potentially to be made significantly conscious past some degree.
