He even repeatedly presents the kingdom of heaven and eternal life as a reward (Matt. 19:29; 25:34, 46) that is already stored up in heaven now (5: 12; 6:20; 19:21; Luke 6:23) and will be distributed at the resurrection (14:14). And that reward will be paid for all sorts of works: for enduring persecution and disgrace (Matt. 5: 10-12), loving one’s enemies (5:46), giving alms (6:4), perseverance (10:22), confessing Jesus’s name (10:32), service to his disciples (10:41-42), giving up everything and leaving it behind (19:21, 29), working in the vineyard (20:1-16), faithfulness in one’s vocation careful management of the goods entrusted to us (25:14-30), mercy toward the disciples of Jesus and so forth. There is therefore no doubt whatever that Jesus uses the idea of reward as an incentive to spur his disciples toward faithfulness and perseverance in the pursuit of their calling. … works. Although salvation is granted to all believers, there will be differences in glory among them, depending on their works (Matt. 10:41; 18:4; 20:16; 25:14ff.). In Scripture, therefore, both in the New and in the Old Testament, there is a close connection between sanctification and glorification. What is sown here is harvested in eternity (Matt. 25:24, 26; I Cor. 15:42ff.; 2 Cor. 9:6; Gal. 6:7-8).
Source: Bavinck, Reformed Dogmatics, Volume Four: Holy Spirit, Church and New Creation, Sanctification and Perseverance, Holiness as Gift and Reward, pp. 234-236