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 , Schweitzer and the early Barth and , in part at least , <WSD>Bultmann</WSD> . 
Meaning of the word marked with <WSD> tags:  a human being