God is good because He blesses obedience.
“If thou shalt hearken diligently unto the voice of the LORD thy God, to observe and to do all his commandments which I command thee this day… 12The LORD shall open unto thee his good treasure, the heaven to give the rain unto thy land in his season, and to bless all the work of thine hand.” (from Deuteronomy 28:1 & 12)
Although this promise is given directly to Israel along with many other promises and blessings in the same chapter, it shows a character trait of God which is consistent with His dealings with all His children. For example, God told Joshua, “This book of the law shall not depart out of thy mouth; but thou shalt meditate therein day and night, that thou mayest observe to do according to all that is written therein: for then thou shalt make thy way prosperous, and then thou shalt have good success.” (Joshua 1:8) A similar promise is repeated in Psalm 1, “1Blessed is the man that walketh not in the counsel of the ungodly, nor standeth in the way of sinners, nor sitteth in the seat of the scornful. 2But his delight is in the law of the LORD; and in his law doth he meditate day and night. 3And he shall be like a tree planted by the rivers of water, that bringeth forth his fruit in his season; his leaf also shall not wither; and whatsoever he doeth shall prosper.”
All throughout Scripture, when God gives a command, He almost always gives a blessing or a promise of good to go with the keeping of that command.
Thank You, God, that You reward those who obey You and that You encourage them by blessing them. Thank You, God, that You show Your goodness in this way.