The lions are the problems that beset a person on his way through life: money, health, the people around him, the fears that circle and threaten. To be cast among them is to stand surrounded by the very difficulties that seem able to devour him. Daniel is the person who does not fight the lions or study them. He turns away from them entirely and inward toward the settled sense of the thing he wants, dwelling there until it feels accomplished.
The God he serves continually is his own consciousness, the I AM that is the life in him, and serving it continually means keeping attention fixed on the fulfilled desire rather than the threat. Deliverance follows from that turning. The lions do him no harm because his attention has left them. A person is saved not by defeating the problem but by turning from it to the felt solution, and the den quietly loses its power over him.