There are many, many different worlds. Just as there are different continents on earth, there are different dimensional planes.

The kundalini comes in two primary forms when it comes forward from a spiritual teacher.

Tantra is for the person who has self control but doesn't care anymore. It is for the person who is able to abandon self-control and its fixation.

There can be very powerful releases of energy that can catch you off guard until you have a better sense of what you are doing.

Yoga makes you free. It makes you happy. It gets you out of the traps that create human misery. It makes you vibrate faster.

The kundalini is raised or brought down. It can be done in several different ways, and as it moves to the different chakras or energy centers in the subtle physical body, it endows one with various powers.

Lao Tsu doesn't seem to hold to much stock for words or phrases or teachings.