How do we know what is good? The Bible tells us that God is good; in fact it speaks of His goodness throughout Scripture.
“For the Lord is good; His mercy is everlasting, and His truth endures to all generations.” Psalm 100:5.
“The Lord is good to those who wait for Him, to the soul who seeks Him. It is good that one should hope and wait quietly for the salvation of the Lord.” Lamentations 3:25-26.
“No one has seen God at any time. The only begotten Son [“The only begotten God.” New American Standard Bible], who is in the bosom of the Father, He has declared Him.” John 1:18.
“And the Word [Jesus] became flesh and dwelt among us, and we beheld His glory, the glory as of the only begotten of the Father, full of grace and truth.”John 1:14.