'I have no difficulties about my principles; though I encounter difficulties, I do not lose my virtue. When winter's cold is come, and the hoar-frost and snow are falling, then we know the vegetative power of the pine and cypress. This strait between Zhan and Cai is fortunate for me.' He took his lute so that it emitted a twanging sound, and began to play. Zi-lu, hurriedly, seized a shield, and began to dance, while Zi-gong said, 'I did not know the height of heaven nor the depth of the earth.'