The concept of the Inward Light, variously understood, was the basis for Quaker missionary activity m the seventeenth century. Quakers made attempts to convert Jews and Muslims, both by going out to meet them and by writing tracts and epistles. Considerable use was made of the Hebrew Scriptures and of the Qur'an. The conversionist approach proved unsuccessful, and this led to a change in the Quaker understanding of mission.
"An Evaluation of the Doctrine of the Inward Light as a Basis for Mission - As Exemplified by Quaker Approaches to Jews and Muslims in the Seventeenth Century,"
Quaker Studies: Vol. 1
, Article 3.
Available at: http://digitalcommons.georgefox.edu/quakerstudies/vol1/iss1/3