The servants (Gr. douloi) are Jesus" disciples to whom He has entrusted the responsibility of managing His affairs during His absence from the earth. Some servants will be faithful and wise (prudent, cf. Matthew 7:24; Matthew 10:16). They will carry out God"s will for them, including feeding the world the gospel, which dispensing food represents in the parable. When Jesus returns, these faithful servants will be "blessed" (i.e, the objects of God"s favor and consequently happy, cf. Matthew 5:3). Moreover Jesus will promote them to positions of greater responsibility in the kingdom that He will establish. [source][source][source]
"The reward of faithfulness is to be trusted with higher responsibilities; cf. xxv21 , 23 , Lk. xvi10a. Since the parable deals with the Parousia, the words apply to higher activities in the age to come." [1][source]