So we have to have a price that makes sense and gives a margin of safety considering the natural vicissitudes of life.

所以我们得定出一个合理价格，留下安全边际以防意外的生。

Now it's that margin of safety that we start to play with.

现在，我们开始利用这个安全边际。

We know where that tipping point is, and we keep building the training capacity of being pain-free until we have a margin of safety.

我们知道那个临界点在哪里，增强无疼痛训练的能力， 直到我们拥有安全边际。