Commentary for Nahum 1:7

The Lord is good yea, a stronghold—Even when he inflicts retribution upon His enemies, His mercies do not cease to do good to those who fear Him. [This ability is] unlike the trait of [a man of] flesh and blood, who, when he is busy with one thing, is not free to [simultaneously] do another thing, as the matter is stated (Exod. 15:3): “The Lord is a man of war; the Lord is His Name.” [This is] as it is stated in Mechilta (ad loc.)

and is cognizant of—the necessities of those who trust in Him.