From Sufism's Sacred Fihi ma Fihi: Discourses of Rumi, Discourse 11, Part 2 of 2

Though the words of the great saints appear in a hundred different forms, since God is one and the Way is one, how can their words be different? Though their teachings appear to contradict, their meaning is one. Separation exists in their outward form only; in inner purpose they all agree. The great saints have seen for themselves, not by proof and rote, but face to face and unveiled, that all people - good or evil – are obedient servants of God. Nothing exists that does not proclaim God’s praise.