You will keep him in perfect peace, whose mind is stayed on You, because he trusts in You. 

Cast your burden on the Lord, and He shall sustain you; He shall never permit the righteous to be moved. § I will trust and not be afraid; ‘For YAH, the Lord, is my strength and song; He also has become my salvation.’Why are you fearful, O you of little faith? § Be anxious for nothing, but in everything by prayer and supplication, with thanksgiving, let your requests be made known to God; and the peace of God, which surpasses all understanding, will guard your hearts and minds through Christ Jesus. § In quietness and confidence shall be your strength.The work of righteousness will be peace, and the effect of righteousness, quietness, and assurance forever. § Peace I leave with you, My peace I give to you; not as the world gives do I give to you. Let not your heart be troubled, neither let it be afraid. § Peace from Him who is and who was and who is to come.