The answer is based on the understanding that demons gain access to the soul through passions and sinful tendencies, while angelic manifestations are associated with cleansing the heart and renouncing base passions.

Soul Dichotomy: The Allure of Demons and the Purity of Angels

The answer is based on the understanding that demons gain access to the soul through passions and sinful tendencies, while angelic manifestations are associated with cleansing the heart and renouncing base passions. As stated in one of the sources, "The devil has no access to the soul when it harbors no passion. Then it is luminous, and the devil cannot behold it. But when it allows passion to move and consents to it, it becomes darkened, and the devil sees it" (source: link txt). This means that most people, by allowing passions and sinful thoughts to dominate, inadvertently create conditions for demons to "mature" within their souls.

Conversely, the decision to see angels is connected with choosing the path of renouncing sin and cleansing the heart. As noted in another source, "And those people who choose the path of renouncing sin and cleansing their hearts are even able, on earth, to see angels and the light of God, which one can behold with a pure heart" (source: link txt). This indicates that angelic manifestations occur less frequently, as they are available only to those who are capable of overcoming everyday passions and sinful inclinations.

Thus, given the general propensity of human souls toward passion and sin, demons have more opportunities to "mature," while angelic manifestations require a conscious renunciation of evil tendencies and spiritual purification—a process that occurs far less frequently.