The Greek adjective glukus (γλυκύς) means sweet — pleasant to the taste. It appears in James 3:11-12 in the metaphor of a spring producing both fresh and salt water, and in Revelation 10:9-10 where John is commanded to eat the scroll that is sweet in his mouth but bitter in his stomach. Glukus contrasts with bitter (pikros) throughout these passages.
The glukus-bitter contrast in Revelation 10 carries the most profound theological weight. The scroll that John eats is sweet as honey in his mouth — the word of God is always glukus, as Psalm 119:103 confirms. But when digested, its content (judgment, suffering, commission) brings bitterness. This captures the prophetic vocation: the word of God is sweet to receive but often painful to deliver. For preachers and prophets, truth-telling is both a delight and a burden. The scroll cannot be only sweet; faithfulness requires digesting its hard parts too.