"文明は最後の教会の最後の石が最後の聖職者に落ちるまでその完成には至らないだろう"

Simplified Meaning:

This quote suggests that humanity will only reach its best state when religious institutions and their rulers no longer have influence. To illustrate, think about a village where all decisions are made by one powerful family who controls everyone’s beliefs and behaviors. Some villagers might think they cannot make their own choices because they have always listened to this family. The quote imagines a time when the villagers finally make their own decisions without any outside influence. People can live more freely, work together better, and use reason and science to solve problems. So, it’s encouraging people to think independently and not rely too much on old traditions. If someone takes this advice, they can question long-standing beliefs and decide what is true for themselves, leading to personal and societal growth.