Lao Tzu says,

 “Nature is eternal for it lives not for itself.” He who has no thought about himself, will not live for himself. We all live for our own selves. There is an astonishing statement in the Upanishads: “The husband does not love the wife; through her, he loves his own self. The father does not love the son; through him, he loves his own self. The mother does not love her daughter; through her, she loves her own self”. The Upanishads say that when we say we love someone then too, it is our own self that we love through that medium. Even when we say we live for others, our statement is not authentic. It is erroneous; for the one we allege we live for, today we might feel to kill tomorrow. I say, “I live for my son”. If tomorrow this son disobeys me, displeases me, goes against my wishes, I will create a thousand obstructions in his way. I will see that I cause him all kinds of hardships in life – and I used to say I live only for him! As long as he gratified my desires, obeyed all my commands, nourished my ego, he was an extension of my ego and I professed to live only for him. If I say, “I live for my wife”. I can only do so when she satisfies my desires; when she is an instrument for the gratification of my passions, my very shadow. Let not this delude you though. I only live for her as long as she is useful to me. The day she is no longer useful, she becomes redundant for my ego. I will then throw her out as we throw away articles that have outlived their use. She becomes so much trash for me.

But we swear we live for others. As long as there is even a vestige of the ego within us, we cannot live for others. Then no matter how much we proclaim, we live for ourselves alone.

The Way of Tao, Volume 1

~Lao Tzu