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我们就像迷失了方向的旅行者;每个人都必须向路人寻求指引。
We are like travelers who have lost their way; we must ask, each one, for directions from a passerby.
To every action there is always opposed an equal reaction; or, the mutual actions of two bodies upon each other are always equal, and directed to contrary parts.
Generally speaking, the errors in religion are dangerous; those in philosophy only ridiculous.