What is Tao? There are fifty avenues between heaven and earth. Take forty-nine and there is one. One is why and the other is why. Help me.

It means that nothing can be perfect, there are always some shortcomings, nothing can be absolute, but there are always opportunities.

In ancient times, there were two methods of divination: divination and divination. The divination is mainly tortoise shell, and the divination is mainly yarrow. The method of divination is explained in detail in the Book of Changes. The method is to take 50 yarrows, leave one unused, and only use 49 divinations.

Fifty yarrow trees represent everything in the world. The unused one represents Tai Chi before the death of heaven and earth. If one of them is omitted, it can be understood that everything comes from Tai Chi.