The New Testament contains a doctrine of salvation for the lost, and a doctrine of rewards for the faithful service of the saved. It is of great importance to the right understanding of the Word that the student should make the clear distinction between these.
Salvation: a Free Gift
"Every one that thirsteth, come ye to the waters, and he that Hath no money; come ye, buy, and eat; yea, come, buy wine and milk without money and without price" (Isa. 55:11Ho, every one that thirsteth, come ye to the waters, and he that hath no money; come ye, buy, and eat; yea, come, buy wine and milk without money and without price. (Isaiah 55:1)).
But in contrast with the freeness of salvation, note that those works that are pleasing to God shall be rewarded.
Works to Be Rewarded
"For other foundation can no man lay than that is laid, which is Jesus Christ. Now if any man build upon this foundation gold, silver, precious stones, wood, hay, stubble; every man's work shall be made manifest; for the day shall declare it, because it shall be revealed by fire; and the fire shall try every man's work of what sort it is. If any man's work abide which he hath built thereupon, he shall receive a reward. If any man's work shall be burned, he shall suffer loss: but he himself shall be saved; yet so as by fire" (1 Cor. 3:11-1511For other foundation can no man lay than that is laid, which is Jesus Christ. 12Now if any man build upon this foundation gold, silver, precious stones, wood, hay, stubble; 13Every man's work shall be made manifest: for the day shall declare it, because it shall be revealed by fire; and the fire shall try every man's work of what sort it is. 14If any man's work abide which he hath built thereupon, he shall receive a reward. 15If any man's work shall be burned, he shall suffer loss: but he himself shall be saved; yet so as by fire. (1 Corinthians 3:11‑15)).
Salvation: a Present Possession
"He that heareth My word, and believeth on Him that sent Me, hath eternal Life, and cometh not into judgment, but hath passed out of death into life" (John 5:2424Verily, verily, I say unto you, He that heareth my word, and believeth on him that sent me, hath everlasting life, and shall not come into condemnation; but is passed from death unto life. (John 5:24)).
"And this is the record, that God hath given to us eternal life, and this life is in His Son" (1 John 5:1111And this is the record, that God hath given to us eternal life, and this life is in his Son. (1 John 5:11)). But rewards are for a future time.
Rewards Bestowed in the Future
God's purpose in promising to reward the faithful service of His saints with heavenly and eternal honors, is to win them from the pursuit of earthly riches and pleasures, to sustain them in the fires of persecution and to encourage them in the exercise of Christian virtues.