Literature Reference: 由由然与之偕而不自失焉。——《孟子·公孙丑上》 He walked with them in a leisurely manner without losing himself. Source from 'Mencius·Gongsun Chou I'.
由: Cause. Matter. Reason.
由: Cause. Matter. Reason.
Meaning: Leisurely and self-assured, maintaining one's composure effortlessly.