It's enough for me to be sure that you and I exist at this moment.

The present state of the system of nature is evidently a consequence of what it was in the preceding moment, and if we conceive of an intelligence which at a given instant comprehends all the relations of the entities of this universe, it could state the respective positions, motions, and general effects of all these entities at any time in the past or future.

解释：死亡、生存、惊恐、惧怕等观念都进入不到他的内心中，因而遇到任何事情都不害怕。