Not my favorite line from the Tao Te Ching, but a good one nonetheless. I think my actual favorite is the very first verse, where he explains that the entire book is a lie (in a sense). I love that so much.
Yep, if you take nothing else from the Tao Te Ching, the first verse is the most powerful concept. The Tao is personal, nobody can tell you what it is, and thereby have power over you.