The ideas of enlightenment philosophers were
based on
(1) efforts to achieve salvation
(2) faith in human reason
(3) traditional practices
(4) the inevitability of poverty

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.