That is the characteristic of being a creature. This is what Francis saw and recognized as uniting us with all of creation. That is what Francis saw in the mystical marriage with Lady Poverty, and it is what motivates the Canticle of the Sun. We did not make ourselves. We are all ultimately dependent.
Nobody is fulfilled.
If that is true, then poverty is what unites us with all other creatures. If that is so, then I suggest that poverty is the key value in the vows. My own reading of the relationship of the vows is that there are not three. There is one, and two further explications. The central vow is poverty.