Jesuit Fathers Campbell and McMahon write in their book, Becoming a Person in the Whole Christ:

The essential foundation of our ability to become a person
lies in our ability to transcend isolation and to share ourselves as free gift
with another.

This capacity for openness to all of reality, the hallmark
of every spiritual being, is the essence of man as person, providing him with
potentialities for human growth that are unlimited. It is also the
“ground” of our capacity for religious experience, making it possible
for God to give Himself to us through a sharing in His divine life, and
ultimately in the fullness of open friendship with Him.