The Perfect Square Has No Corners

I love this passage from the Tao Te Ching (chapter 41):

The wise student hears of the Tao and practices it diligently.

The average student hears of the Tao and thinks about it now and then.

The foolish student hears of the Tao and laughs out loud.

If there were no laughter, the Tao would not be what it is.

Hence it is said:

The bright path seems dim; and going forward seems like retreat;

The easy way seems hard; the highest Good seems empty;

Great purity seems sullied; a wealth of Goodness seems inadequate;

The strength of the Good seems frail; real Good seems unreal;

The perfect square has no corners; great talents ripen late;

The highest notes are hard to hear; the greatest form has no shape.

The Tao is hidden and without name.

The Tao alone nourishes and brings everything to fulfillment.