The sign above the door in Iroh's tea shop says "I'd rather go three days without eating than one day without tea!"
The sacral chakra, or chakra of water, is located in the genitalia. The guru talks about this chakra, but unlike all the other chakras, he omits where it is located.
Chakras are a fixture of Indian, specifically Hindu, beliefs regarding physical and mental health. A chakra is a disk of energy that spins through and around the pattern in an orbital pattern. The energy can be blocked, or the pattern the energy can become out of orbit. Chakras can also become overactive, causing the energy to move too quickly.