Sentence:  In Psalm 27 : 1 you read those beautiful words which you must have in your heart if you are to <WSD>master</WSD> the fears that surround you , or to drive them out if they have you in their grip : `` The Lord is my light and my salvation ; whom shall I fear ? 
Meaning of the word marked with <WSD> tags:  get on top of; deal with successfully