An important philosophical idea during the enlightenment was that

 ordinary people should be able to pursue greater opportunities,

Explanation:

The Enlightenment was a time when ideals of freedom, liberty, and fraternity were ideas that inspired the people to have a voice and become part of public matters and politics.

The Enlightenment promoted the idea of setting a limit to the once limitless power of the kings. Since the rulers were despotic and considered themselves above the rule of law, they were to be limited by parliaments and constitutions.

Furthermore, in France, intellectuals began to promote the end of slavery and women's rights to the populace.This was also in part done by the publications since the printing press had shortly been introduced as a way to promote reforms for women right and liberties for common peoples.