הָאֵ֖ל תָּמִ֣ים דַּרְכּ֑וֹ אִמְרַ֤ת יְהוָה֙ צְרוּפָ֔ה מָגֵ֣ן ה֔וּא לְכֹ֖ל הַחֹסִ֥ים 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 kabbalistic (mystical) interpretation of II Samuel 22:31: and classical mystical sources.