Question

The ideas of Enlightenment philosophers were

Answer 1

The ideas of philosophers who were active during the Enlightenment period were that (2) faith in human reason was something they were ready to acknowledge.

This period itself was devoting a lot of thought and time into the idea of human rationalism, human advancement, science, and technology (all of these in their limited form at their time, as we're talking a few centuries in the past). 

The philosophers that are considered to be from this period were Benjamin Franklin, Descartes, Diderot, etc.