How does the meaning of the word “humanism” differ today from its meaning in the 15th century? Why is there such a difference?

The word “humanism” in the 15th-16th centuries meant an increased interest in all types of human activity, but did not include a moral assessment of this activity: Rabelais and Columbus, Luther and Loyola were equally humanists. The idea of the need to limit the “comprehensive self-expression” of the human person by laws arose only in the 17th century, after the costs of “boundless humanism” became clear to everyone.