…is in God.
"Grant, Oh Father, that my mind may rise to Thy sacred throne. Let it see the fountain of good; let it find light, so that the clear light of my soul may fix itself in Thee. Burn off the fogs and clouds of earth and shine through in Thy splendor. For Thou art the serenity, the tranquil peace of virtuous men. The sight of Thee is beginning and end; one guide, leader, path, and goal." (Part III, Poem 9, p. 54)
As I suspected, a belief in something other-worldly must exist to accept the principles of happiness that can only be found in the perfection offered by a Supreme Being, and untainted by the way of man–as everything upon this earth appears to be.
To forego any belief and trust in happiness upon this earth except in that knowledge and firm conviction that there is a great beyond this lifetime…well, that takes faith. Boethius probably has it.
But then again, if this belief itself, this trust in soul that flies from earth to live forever on, brings contentment and true happiness to mortal man, what does it matter if it be true or false? The happiness is here and now, and disappointment is impossible, as if no more exists, then that as well does not.