And whosoever shall give to drink unto one of these little ones a cup of cold [water] only in the name of a disciple, verily I say unto you, he shall in no wise lose his reward.
Note 6 at Mt 10:42: This verse shows that even our smallest acts of kindness will be rewarded. As revealed in 1Co 3:13, every person's work shall be tried to determine "what sort it is," not what size it is. Many people who have never done anything to gain the attention of the masses will shine bright in the day when the Lord passes out His rewards.
Some of the Lord's rewards for our actions come in this life, such as children (Ps 127:3-5), financial blessings (1Ti 5:18), health (Isa 58:6-8 with Mt 6:18), etc. However, some of our rewards will not be realized until we stand before God. This is the case with the reward for enduring persecution (Mt 5:12 and Lu 6:23). Moses was motivated by the recompense (compensation) of this reward (Heb 10:35 and 11:26).
Many of the rewards for ministering the Gospel will not come until we appear before the Lord (1Co 3:8-13 and 9:17). As stated in Mt 10:41 and illustrated in 1Sa 30:21-25, rewards can be shared by those who aid others in their righteous tasks [Ro 10:14-15 and 2Jo 10-11 (negative example)].
Our good deeds that would normally be rewarded by our Father can be voided if we do them seeking the praise of people (Mt 6:1-4). We can also receive a partial reward (2Jo 8).
Those (ungodly) who are not in the kingdom of God will receive no rewards even though some of their actions might have been good (Pr 24:20). Rewards are only for those who have been cleansed from their evil deeds by the blood of the Lamb. Regardless of what these rewards shall be, there will not be any exalting of self over another. 1Co 4:7 says, "For who maketh thee to differ from another? and what hast thou that thou didst not receive? now if thou didst receive it, why dost thou glory, as if thou hadst not received it?" The twenty-four elders in Re 4:10 are shown casting their crowns (which are rewards) down before the Lord and giving all their praise and worship to Him.