The Inner Light grounds the whole of Quakerism: its unprogrammed worship, its refusal of a separate priesthood, its rejection of outward sacraments, and its testimonies of equality, simplicity, and peace, since that of God in every person underwrites the dignity of all. The teaching that the divine light is present universally distinguishes Quakerism from traditions that locate authority chiefly in scripture, church, or ordained ministry, and it explains the movement's early radicalism and its enduring emphasis on conscience and direct spiritual experience.
Liberal, unprogrammed Quakers today often read the Inner Light in a universalist register, as a divine reality accessible under many names and compatible with insight from other religious traditions or none, a stance formalised in some Yearly Meetings' openness to non-theist and universalist Friends. Evangelical and programmed Friends, particularly the large Kenyan and other African and Latin American bodies, reject this broadening and insist the Light is specifically the light of Christ, consistent with historic Quaker Christology and with the wording of Fox's own journal; the disagreement over how explicitly Christian the doctrine must remain is one of the deepest fault lines within worldwide Quakerism today, straining the Friends World Committee for Consultation that seeks to hold the branches in relationship.