 | I the LORD search the heart and examine the mind, to reward a man according to his conduct, according to what his deeds deserve. |
 | I the LORD search the heart, I try the reins, even to give every man according to his ways, and according to the fruit of his doings. |
God rewards or punishes ultimately according to the condition of our hearts.
A heart which has faith in Him, submits to His will, obeys His Word, and serves Him, is a heart which actually doesn't get what it deserves -- eternal punishment.
Our most important commandment is to love God with our whole heart (Matt. 22:37). With this heart a person believes in Christ and so experiences both love from God and the presence of Christ in the heart (Rom. 5:5; 10:9-10; Eph. 3:17)..