What keep something out also keeps something in, hence the beauty and necessity of gates. Boundaries with no exits or entrances stifle life. There’s no flow. We need both and the consciousness to decipher where to draw the line and where to welcome and open.
Boundaries are often created out of fear and are consequently rigid and impede growth. When created out of a sense of needful care they support life. We can relax in the appropriateness of them, and know we make better neighbors when both a boundary and a gate are present.