Meditation reveals the hidden treasures of the darkness

Isaiah 45:3 And I will give thee the treasures of darkness, and hidden riches of secret places, that thou mayest know that I, the Lord, which call thee by thy name, am the God of Israel.

Matthew 6:6 But thou, when thou prayest, enter into thy closet, and when thou hast shut thy door, pray to thy Father which is in secret; and thy Father which seeth in secret shall reward thee openly.

As the bible is allegorical, darkness is a metaphor for meditation, as is going into the closet. When you close your eyes you effectively go into your closet and into darkness. That is the closet, that is the hidden place. Isaiah 45 is telling us to close our eyes and meditate and the hidden treasures of the kingdom of heaven will be revealed. Matthew 6:6 tells us that meditation is the way to pray. Don't ask God for anything, just meditate and listen subconsciously.