הָאֵל֮ תָּמִ֪ים דַּ֫רְכּ֥וֹ אִמְרַֽת־יְהוָ֥ה צְרוּפָ֑ה מָגֵ֥ן ה֝֗וּא לְכֹ֤ל ׀ הַחֹסִ֬ים בּֽוֹ׃
As for God, His way is perfect; the word of the LORD is tried; He is a shield unto all them that take refuge in Him.
Read Jewish philosophical commentary on Psalms 18:31: and classical philosophical sources.