How few things there are which can be proved! Proofs only convince the mind. Who has ever been able to prove that tomorrow will come, and that we shall die? And what could be more generally believed?…In short, we must rely on faith when the mind has once perceived where truth lies, in order to quench our thirst and color our minds with a faith that eludes us at every moment of the day.

Source: A Third Testament

Though we pursue fantasy, the soul’s only true sustenance is reality. Few understood this like William Blake.