It is He who sent down tranquility into the hearts of the believers that they would increase in faith along with their [present] faith. And to Allāh belong the soldiers of the heavens and the earth, and ever is Allāh Knowing and Wise.
Allah is the One Who sent down stability and tranquility into the hearts of the believers so that they increase in faith over and above their faith. To Allah alone belongs the forces of the heavens and the earth, He supports with them whoever of His servants He wishes. Allah knows the interests of His servants and He is Wise in the assistance and support that He gives.