Literature Reference: 昊天已威，予慎无罪。昊天大幠，予慎无辜。—— 《诗经·小雅·节南山之什·巧言》 The vast heavens are awe-inspiring; I am cautious and without fault. The vast heavens are immense; I am cautious and without guilt. Source from 'The Book of Songs·Xiao Ya·Jie Nan Shan Zhi Shi·Qiao Yan'.
慎: Be mindful; tread with caution.
无: No, it's clean, won't happen.
Meaning: Being cautious and without fault, it expresses a strict requirement for one's behavior and a high pursuit of morality.