This is what “everyone” says, and it’s accurate in my experience.
We all have innumerable parts – or subpersonalitites, voices, or whatever we want to call them.
Each of these parts wants what we want. They want love, acceptance, understanding, a partnership.
We often try to find this in the world. And although it can work to some extent, it doesn’t really work. (If it seems to work, it’s because finding love from someone else allows us to more easily give it to ourselves and these parts of us.)
We are the only one who can give these parts of us what they really want. We are the only ones in a position to give them the love, acceptance, understanding and so on that they seek.
We are the only one in a position to be a guru, friend, parent, or lover to these parts of us.