Peacefulness is an inner sense of calm - it comes from becoming still - in order to reflect and meditate on our inner wisdom and receive answers. A peaceful heart is one that is free from worry and rouble. It's becoming quiet so we can look at things quietly so we can more clearly understand them and thus come up with creative solutions. It is learning to live in the present. Freedom from desire leads to inner peace.
Having reached a high level of realization (or having accomplished anything in life), don't get excited or puffed up with pride but remain calm, humble, and in "perfect equanimity" if you want to continue in this deep state of consciousness.
When good thing are accomplished, it does not claim (or name) them. This is Te, which is close in meaning to power or virtue. It is something within a person, and it is enhanced by following the Tao, or 'that from which nothing can deviate'.
The master does his job and then stops. He understands that the universe is forever out of control, and that trying to dominate events goes against the current of the Tao.
Highest good is like water. Because water excels in benefiting the myriad creatures without contending with them and settles where none would like to be, it comes closest to the way.