Literature Reference: 惟清惟肃，靡闻靡见。—— 《唐德明兴圣庙乐章 亚献终献》 Purely clear and solemn, nothing is heard or seen. Source from 'Tang Deming Xingsheng Temple Music: Second and Final Offering'.
惟:
肃: Respectful, solemn, and earnest.
Meaning: Purely solemn, symbolizing seriousness, reverence, and devotion.