逻辑学的研究是对正确推理原则的研究。

Operational effectiveness and strategy are both essential to superior performance, which, after all, is the primary goal of any enterprise.

文字的力量在于它们创造整个世界的能力。

赏析：通过忘记脚、忘记腰、忘记是非纠纷来说明内心的舒适和自在，强调了要放下杂念和纷争，保持内心的平静。