"もし私たちの種が宇宙で唯一のものであるならば、宇宙は非常に低い目標を設定し、非常に少ないもので満足したと言わざるを得ない。"

Simplified Meaning:

The quote is suggesting that if humans are the only intelligent beings in the entire universe, then the universe hasn’t reached its full potential. Imagine you are in a huge forest, but there’s only one type of tree growing there. That would be disappointing because you’d expect more variety in such a big place. Similarly, the universe is vast and it would be surprising if there was only one form of life. In a way, it’s like a school class where there is only one student. The school has a massive playground, lots of classrooms, and many teachers, but just one student shows up. It feels like all that effort and space are going to waste. Applied to life, this idea can encourage us to stay curious and look for more. Just as we wouldn’t be satisfied with just one type of tree or one student, we shouldn’t easily accept the idea that we are the only ones out there in the universe. This curiosity can motivate people to explore more, learn about the unknown, and not settle for what seems like the only option.