And the Lord said unto Cain, Where is Abel thy brother? And he said, I know not: Am I my brother's keeper?

Now faith is the assurance of things hoped for, the conviction of things not seen. [Hebrews 11:1].

For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made... [Romans 1:20].

Do not forget to entertain strangers, for by so doing some have unwittingly entertained angels. [Hebrews 13:2].

And now Israel, what does the Lord your God require from you, but to fear the Lord your God, to walk in all His ways and love Him, and to serve the Lord your God with all your heart and all your soul. [Deuteronomy 10:12].

Many sorrows shall be to the wicked: but he that trusteth in the Lord, mercy shall compass him about. (Psalms 32:10)