The answer to this question determines who we are…
Wikipedia equates Existential Humanism with 'Self-knowledge'. However, I like Yuval Noah Harari's definition better, equating humanism with the creation of higher meanings. In this way, we are above all "artificial constraints" like theories and laws, that tend to make us miserable and "anti-human". This promises some "liberation", but also presses responsibility. This is where "modern dialectics" could come in handy, telling us how to combine "absolute freedom" with "absolute responsibility"…
“A man goes to knowledge as he goes to war: wide-awake, with fear, with respect, and with absolute assurance. Going to knowledge or going to war in any other manner is a mistake, and whoever makes it might never live to regret it”
― Carlos Castaneda, The Teachings of Don Juan: A Yaqui Way of Knowledge