Just as the number one can never be reduced to zero, once we act or speak, our action or speech is never completely erased.
An old Oriental saying tells us, "Sow good, and the harvest will be good. Sow evil and reap evil." We must understand that everything we do comes back to ourselves.
Therefore before wishing for our own happiness and welfare and that of our children we must do good in secret. To do good in secret means to act without seeking attention and praise, to act without any hope of reward. This is called intoku.
Among the various ways of performing intoku, to walk the way of the Universe and to lead others along this way is best.