Literature Reference: 神其来格，明祀惟虔。—— 《郊庙歌辞 周宗庙乐舞辞 肃顺》 May the spirits descend and the sacrifices be made with utmost reverence. Source from 'Jiaomiao Geci Zhou Zongmiao Yuewu Ci Susun'.
惟:
虔: Respect and reverence.
Meaning: It signifies utmost piety and reverence towards deities or ancestors.