Catholicity seized on man... and the mystics, transcending all, taught him to ascend on high with the wings of contemplation the Ladder of Jacob composed of brilliant stones, by which God descends to Earth and man ascends to Heaven, till Earth and Heaven, and God and man, burning together in a conflagration of infinite charity, are transmuted into one.

Essays on Catholicism, Liberalism, and Socialism, 1879.