Instruction In Yoga
This is the beginning of instruction in yoga.
Yoga is the control of thought-waves in the mind.
Then man abides in his real nature.
At other times, when he is not
in the state of yoga,
man remains identified with the
thought-waves in the mind.
Practice is the repeated effort
to follow the disciplines
which give permanent control
of the thought waves of the mind.
Practice becomes firmly grounded
when it has been cultivated for a long time,
uninterruptedly, with earnest devotion.
— Patanjali’s Yoga Sutras
(From Sacred Jewels of Yoga)