The Bible tells us over and over that God is good:
"Teach me to do Thy will; for Thou art my God: Thy Spirit is good;
lead me into the land of uprightness." Psalm 143:10
"O give thanks unto the LORD; for He is good;
for His mercy endureth for ever." I Chronicles 16:34
"And they sang together by course in praising and giving thanks unto the LORD; because He is good, for His mercy endureth for ever toward Israel." Ezra 3:11
"Good and upright is the LORD: therefore will He teach sinners in the way." Psalm 25:8
"O taste and see that the LORD is good: blessed is the man that trusteth in Him." Psalm 34:8
"For the LORD is good; His mercy is everlasting;
and His truth endureth to all generations." Psalm 100:5
"Praise ye the LORD. O give thanks unto the LORD; for He is good:
for His mercy endureth for ever." Psalm 106:1
"Praise the LORD; for the LORD is good:
sing praises unto His name; for it is pleasant." Psalm 135:3
"The LORD is good, a strong hold in the day of trouble;
and He knoweth them that trust in Him." Nahum 1:7
This is not an exhaustive list of course, but just gives us an idea of how full the Scriptures are of proclamations of the goodness of God. Or as Andy Griffith would have said, "He's real goooood!"
When someone is "real good" that is not only someone we want to be with, it is someone we can trust. It is someone we know will be constant and true. The Lord our God is the one Person in whom we can put our faith and trust and know we will never, NEVER be let down or disappointed. In fact, He will be for us "abundantly above all that we ask or think."
We can trust Him because He IS good.