"The Lord is good, A stronghold in the day of trouble; And He knows those who trust in Him. But with an overflowing flood He will make an utter end of its place, And darkness will pursue His enemies" (Nahum 1:7-8).
The mighty city of Nineveh was no match for Almighty God. The Lord was preparing His judgment, and He does not acquit the wicked (Nahum 1:3). Yet, God knows those who trust Him. He is their protection in the day of trouble.
What does it mean to trust the Lord? Solomon sums it up in Proverbs 16:20, "He who heeds the word wisely will find good, and whoever trusts in the Lord, happy is he." Trusting God means putting your faith in God's purposes that are revealed in His word, including His commands, and then heeding (doing) them. Trusting Jesus is much more than saying it, then living as you please. It means to listen to His word and follow it in all things.
The old gospel song still rings true, "Trust and obey, for there's no other way to be happy in Jesus, but to trust and obey." He knows whether you are trusting Him today.