Revelation 10:8-11. The voice from Heaven tells John to go and take the little scroll from the angel who is standing on the sea and on the land. John goes to the angel and asks for the scroll and the angel says "Take it and eat, it will be bitter to your stomach, but sweet as honey in your mouth." So John does eat it and it is sweet in his mouth but bitter in his stomach. Then he is told he must prophesy again about many peoples and nations and tongues and kings.

All of Revelation is highly relevant right now, I recommend a full reading or two! This scene takes place after the scrolls have been opened, the warning has occurred, and after the sixth trumpet blast, which releases the four angels who had been held bound until the hour, day, month, and year when a third of mankind was to be killed. This angel is not one of them, however. This one descends from heaven wrapped in a cloud with a rainbow over its head and a face like the sun and sets his right foot on the sea and his left on the land. He calls out and seven thunders roar in answer, but John is told not to write down what the thunders say and instead to go take the scroll from the angel.

So, to recap, at this point, one-third of humanity has just been killed, and this is after the opening of the scrolls, the warning, the fire from heaven, the turning of the seas and the waters to blood, the shortening of days and nights, one-third of the stars falling from the sky, the opening of the bottomless pit, and five months of torment by poisonous locusts. In short, it's been a hell of a time on earth! Now this angel is here, calling out to the thunders, and receiving a response that John is not to tell of. Clearly there is much more to come. You can almost cut the tension with a knife!

But yet this scene is a little pause of hope. God never forgets about us. In fact, everything that is happening in Revelation is geared towards our salvation (we just stubbornly keep refusing to give up our evil ways after each trial). The angel pauses to give John a scroll. It is sweet in his mouth but it makes his stomach bitter because there is more to come and now he has the duty of more prophecy (and we have seen before how thankless the lot of a prophet is). 

This shows that God will always raise us up raise up prophets for us when we need them most. He will always, even in the midst of worldwide calamity, provide people to speak truth to us. It may be bitter in their stomachs, and it may be bitter for us to hear, but it is sweet in their mouths and, if we listen properly, it can be sweet to our ears, as well. We just have to let go of our wicked ways, and see even the trials as gifts from God bringing us closer to Him.