To practice virtue is to selflessly offer assistance to others, giving without limitation one's time, abilities, and possessions in service, whenever and wherever needed, without prejudice concerning the identity of those in need.
Shape clay into a vessel;
It is the space within that makes it useful.
Cut doors and windows for a room;
It is the holes which make it useful.
Therefore benefit comes from what is there;
Usefulness from what is not there.
The great Tao flows everywhere. All things are born from it, yet it doesn't create them. It pours itself into its work, yet it makes no claim. It nourishes infinite worlds, yet it doesn't hold on to them. Since it is merged with all things and hidden in their hearts, it can be called humble. Since all things vanish into it and it alone endures, it can be called great. It isn't aware of its greatness; thus it is truly great.
Ever desireless, one can see the mystery. Ever desiring, one can see the manifestations. These two spring from the same source but differ in name; this appears as darkness. Darkness within darkness. The gate to all mystery.