In that hour Jesus rejoiced in spirit, and said, I thank thee, O Father, Lord of heaven and earth, that thou hast hid these things from the wise and prudent, and hast revealed them unto babes: even so, Father; for so it seemed good in thy sight.
Note 6 at Lu 10:21: The Greek word used here for "rejoiced" is "AGALLIAO," and it means "to jump for joy, i.e. exult" (Strong's Concordance). It is the same word that is used in 1Pe 1:8 where it says that we "rejoice with joy unspeakable and full of glory." Although Jesus was a man of sorrows and acquainted with grief (Isa 53:3), He also rejoiced. Jesus promised to give us His joy so that our joy might be full (Joh 15:11).
Note 7 at Lu 10:21: Jesus was repeating a familiar theme (Mt 16:17; Joh 6:44, 65, 7:16-17, and 8:43) of revelation knowledge (see note 9 at Joh 6:45).