Sentence:  We have aligned ourselves with that `` liberal '' tradition in Protestant Christianity that counts among the great names in its history those of Schleiermacher , Ritschl , Herrmann , Harnack , and Troeltsch , and more recently , <WSD>Schweitzer</WSD> and the early Barth and , in part at least , Bultmann . 
Meaning of the word marked with <WSD> tags:  a human being