Mighty Buildings
He whose soul does not soar in the wide expanses, he who does not seek the light of truth and goodness with all his heart, does not suffer spiritual devastation. But neither does he acquire mighty buildings. He takes shelter in the shade of natural havens, like the hares who take shelter in the clefts of the rock. But when a person has a robust soul, his soul can shelter only in structures that he erects with his spiritual toil, never ceasing from his vigorous labor.
Orot Hakodesh II, p. 314