《礼记·祭统》
心无杂念，所思所想必然合乎正道；手足不乱动，抬手动脚必然合乎规矩。
心不茍虑，必依于道；手足不茍动，必依于礼。
If there are no distracting thoughts, what you think and think must be in line with the right path; if your hands and feet do not move disorderly, your actions must be in line with the rules.