# The pride of your heart has deceived you

The "heart" was associated with emotions. The Edomites' pride caused them to be deceived about their security. Alternate translation: "Your pride has deceived you" or "Your pride causes you think you are safe" 

# in the clefts of the rock

“in the gaps in the rock" or "in rock caves"

# say in your heart

"say to yourselves" or "think" 

# Who will bring me down to the ground?

"No one can bring me down to the ground." or "I am safe from all attackers."