The cross is a symbol that is everywhere. It has many levels of meaning. But, we never unpack them. What does the cross symbolize?
1. The First Noble Truth, Life is Suffering.
We are all accustomed to seeing the cross. But, because it is so common, we do not see it as the image of torture and misery that it is.
Imagine that you live a comfortable, sheltered life. That you are materially successful, or well off. What can your relationship with the cross be?
Taken honestly, the cross can only be a reminder of the discomfort of the world. It shows that the ultimate truth to this world is unhappiness: that everything is fleeting, temporary, and vain; that everything ends in pain, in death, in mortality.
2. The means of spiritual development: self-simplification, renunciation, pain.
The way of escaping the world is through, strangely, embracing all the things which are contrary to us. By simplifying ourselves, and by renouncing our personal will and selfishness, we can perhaps make ourselves into something that is not perishable.
3. Immortality.
How can a man become immortal? This is the greatest question of human life. To me it is strange that we, as mortal men, have an image ubiquitously in front of us that expresses the formula for man becoming immortal. But, we do not realize it.
I would argue that, through absolute negation (the dark night of the soul), can come absolute affirmation. As Jesus says in the Gospel of Thomas:
"If the flesh came into existence because of the spirit, it is a marvel. But if the spirit came into existence because of the body, it is a marvel of marvels. But as for me, I wonder at this, how this great wealth made its home in this poverty."