Internalization of the harsh realities?

Does "internalization of the harsh realities" mean "making the harsh realities one part of your mind"?

Context:

Now you shift the subject from "based on truth" to some other
standard. To answer the original boast, the Roman Pantheon is based
upon ordinary occurrences in the natural world, such as the procession
of seasons and rian from the sky falling in the sea. Buddhism is
based on the observation that most human life is a period of
suffering. Hinduism is based on the dichotomy between the purity of
intellect and the evanescence and fragility of human life. Taoism is
based on the unification of polarities. Christianity is based on the
life of a teacher who had extraordinary insight to the requirements of
human society. Judaism is based upon internalization of the harsh
realities of desert survival. Islam is based on the teachings of one
man who taught acceptance and submission to the realities of a hostile
environment. Amerindians often taught the acceptance of the
apparently inevitable.

And so forth. All of them were based on truth.