If you want to know more: Jürgen Habermas and Tzvetan Todorov
In his dialogue with the then Cardenal Ratzinger, Habermas felt confident about grounding liberal Humanism in "weak assumptions about the normative content of the communicative condition of socio-cultural forms of life, to defend a non-defeatist notion of rationality against contextualism, and a non-decisionist notion of justice against legislative positivism" (2005: 19, my translation). Equally, Tzvetan Todorov candidly admits that "the humanist doctrine's anthropology [...] is relatively meager", for "Apart from the biological identity of the species, it is reduced to a single feature, sociability" (2002: 32).
works cited
Habermas, Jürgen & Ratzinger, Joseph. Dialektik der Säkularisierung: über Vernunft und Religion. Freiburg i. Brsg.: Herder, 2005.
Todorov, Tzvetan. Imperfect Garden: The Legacy of Humanism. Princeton: Princeton UP, 2002.