If you know something to be true, but is hard to express, like a love relationship, or a spiritual conviction, how do you become *confident* that it is the highest thing to which you can dedicate your life?
This is the question of Verse 21. Lao Tzu answers his own question with an emphasis on practicing TE, or Highest Virtue. This "TE," by the way is the TE in Tao TE Ching, or the Book about The Way of Virtue.
The practice of this Virtue is ever-reinforcing, enabling in one a calm, serene confidence (not certainty) or intuition that there actually is a Tao, and this Tao CAN be cooperated with.
The more we cooperate with Tao, the more confidence we have in Tao's paths and ways as we live them out.
Thanks to Dale Roberts for his voice in this episode, including a rather comprehensive question.