William Stringfellow was an Episcopalian theologian, lawyer, and friend of the Jesuit poet and peace activist Father Dan Berrigan. Stringfellow was influenced in part by the French Reformed Church theologian Jacques Ellul. He died on March 2, 1985.
Here is a description of holiness from The Politics of Spirituality:
…being holy, becoming and being a saint does not mean being perfect but being whole; it does not mean being exceptionally religious, or being religious at all, it means begin liberated from religiosity and religious pietism of any sort; it does not mean being morally better, it means being exemplary; it does not mean being godly, but rather being truly human; it does not mean being otherworldly, but it means being deeply implicated in the practical existence of this world without succumbing to this world or any aspect of this world, no matter how beguiling. Being holy means a radical self-knowledge; a sense of who one is a consciousness of one’s identity so thorough that it is no longer confused with the identities of others, of persons or of any creatures or of God or of any idols.