Strength and Vigor
This term is used mostly in literary criticism to refer to a vigorous life force, the intensity of language, a burst of literary talent, an overwhelming impact, as well as a powerful appeal to readers’ hearts. It requires the author to maintain a lucid mind, be filled with positivity, have abundant self-cultivation, embrace noble ideals, be unbridled in literary expression, possess a variety of styles, and infuse spiritual strength into his whole work.
A poet’s musings can be likened to a soaring eagle; a literary work should inspire awe like a rainbow across the sky. He feels as if placed on a steep and lofty cliff overlooking the Wuxia Gorge. Clouds swiftly drift away, escorted by a strong wind. Thus, he cultivates vital energies deep inside him, grows in fortitude, and lives out his simple and unadorned life adhering to the principle of propriety. A poet should fully understand the rules governing the robust, ceaseless operation of heavenly forces and needs to accumulate inner strength to produce truly good poetry. (Sikong Tu: Twenty-four Styles of Poetry)
Shi Yannian is vigorous and unrestrained. He prizes moral integrity. When reading a book, all he does is to get a basic understanding of its essential meaning. But when he writes, he writes with vim and vigor. He excels at poetry. His calligraphy is also admirable. (The History of the Song Dynasty)