Self-love, then, is a necessary principle of action.
因此,自爱是行动的必要原则。
"To choose doubt as a philosophy of life is akin to choosing immobility as a means of transportation."
天下的事情,祸患常常产生于疏忽细微之处,而人的志向也要警惕逐渐放纵。
要理解行为,就要寻找其中的效用。