"To be truly human is to engage in a dialectical relationship with the world."

"Man's ontological vocation is to be a subject who acts upon and transforms his world, and in so doing moves toward ever new possibilities of fuller and richer life individually and collectively."

"No one can be authentically human while he prevents others from being so."

"Hope is an ontological need."

"The more radical the person is, the more fully he or she enters into reality so that, knowing it better, he or she can better transform it."