They cried one to the other,
“Holy, holy, holy is the LORD of hosts!
All the earth is filled with his glory!”
At the sound of that cry, the frame of the door shook
and the house was filled with smoke.

Then I said, “Woe is me, I am doomed!
For I am a man of unclean lips,
living among a people of unclean lips;
yet my eyes have seen the King, the LORD of hosts!”
Then one of the seraphim flew to me,
holding an ember that he had taken with tongs from the altar.

He touched my mouth with it and said,
“See, now that this has touched your lips,
your wickedness is removed, your sin purged.”

Then I heard the voice of the Lord saying,
“Whom shall I send? Who will go for us?”
“Here I am,” I said; “send me!”

Isaiah

Brothers and sisters:
That I, Paul, might not become too elated,
because of the abundance of the revelations,
a thorn in the flesh was given to me, an angel of Satan,
to beat me, to keep me from being too elated. 
Three times I begged the Lord about this, that it might leave me,
but he said to me, “My grace is sufficient for you,
for power is made perfect in weakness.” 
I will rather boast most gladly of my weaknesses,
in order that the power of Christ may dwell with me. 
Therefore, I am content with weaknesses, insults,
hardships, persecutions, and constraints,
for the sake of Christ;
for when I am weak, then I am strong.

2nd Corinthiens