•Why it earns a slot
Nearly every line reads like a riddle on first pass and a plain instruction on the second, which is the whole method of the text.
The Tao Teh King, traditionally attributed to Lao Tzu, is 81 short chapters of paradoxical verse and aphorism arguing that the Tao, the way of the universe, cannot be named or forced, and that a ruler or a person governs and lives best by yielding, softness, and non-action rather than by control and striving.
This distillation is written from the freely available original, which is always the better read when you have the time: gutenberg.org.