Here is the ground of the believer's confidence. Jesus, as the sinner's Surety, made God his hope, and rested his salvation upon him and his covenant-engagements.
Related Commentaries of Psalms 91:9
Psalms 91:9-10
9 Because thou hast made the LORD, which is my refuge, even the most High, thy habitation;
10 There shall no evil befall thee, neither shall any plague come nigh thy dwelling.