It (Tao) is eternally without desire. So, it can be called small. All things return to it, although it does not make itself their ruler. So, it can be called great.
LaoziThe 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.
Laozi