To get back up to the shining world from there My guide and I went into that hidden tunnel, And Following its path, we took no care To rest, but climbed: he first, then I-so far, through a round aperture I saw appear Some of the beautiful things that Heaven bears, Where we came forth, and once more saw the stars.

Because your question searches for deep meaning, I shall explain in simple words

Justice divine has weighed: the doom is clear. All hope renounce, ye lost, who enter here.

Consider your origins: you were not made to live as brutes, but to follow virtue and knowledge.

When I had journeyed half of our life's way, I found myself within a shadowed forest, for I had lost the path that does not stray.

Often a retrospect delights the mind.

He who awaits the call, but sees the need, Already sets his spirit to refuse it.