Mostly, in quotes of value, the words do speak for themselves, but there is almost always an invitation to think more deeply and to analyze what it means to ourselves as individuals, not just to others.
'Others' is a key factor in this particular quote.
The essence is that, without a concept of unity within our diversity, without an understanding that every human alive actually wants the same things out of life (albeit from differing persepctives), we end up building barriers, walls, doctrines and rules designed to exclude, rather than include. As soon as we start to exclude we fund fear of invasion. We fear aggression and end up giving it out instead. All too readily, even reading this, minds have gone to the international and world affairs angle.
However, this is equally true in our own little microscopic worlds. As long as we hold onto strong ego, individual identity, with a privilege of 'me and mine', we create the space for fear to enter. It can take the form of shame, loss, angst, bitterness, criticism... endless are the disguises of fear.
Fear is the great energizer for some, immobiliser for others. Fight or flight. It can hold us back from reaching out, or being reached.
Overcoming fear takes Love of the capital variety - and lots of it. The high-level Love which engenders trust and togetherness, a sense of belonging. Once that is achieved, we can begin to see how working and sharing as one with 'the other' - be it a parent, a child, a colleague, a whole community - benefits all... but most of all, our little individual selves.