What is the significance of the little book/scroll that John and Ezekiel must eat (Rev. 10:10, Ezek. 2:9-3:3)?

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There are two references to these "little books" or "scrolls", one in the Book of Revelation:

Revelation 10:2: "and having in his hand a little scroll being open. And he placed his right foot upon the sea, and the left upon the
earth."

Revelation 10:10: "I took the little book out of the angel’s hand and ate it, and in my mouth it was sweet as honey; and when I had eaten it, my stomach was made bitter."

Another appears in the Book of Ezekiel:

Ezekiel 2:9-3:3: "Then I looked, and behold, a hand was extended to me; and lo, a scroll was in it. ¹⁰When He spread it out before me, it was written on the front and back, and written on it were lamentations, mourning and woe."

Ezekiel 3:1-3:3: "Then He said to me, ‘Son of man, eat what you find; eat this scroll, and go, speak to the house of Israel.’ ²So I opened my mouth, and He fed me this scroll. ³He said to me, ‘Son of man, feed your stomach and fill your body with this scroll which I am giving you.’ Then I ate it, and it was sweet as honey in my mouth."

What is the significance of the little book/scroll? Why is it sweet in the mouth and bitter to the stomach, and why do they appear in both Revelation and Ezekiel?