Strengthen the weak hands...

...and make firm the feeble knees.
Say to those who have an anxious heart,
'Be strong; fear not!
Behold, your God will come with vengeance,
with the recompense of God.
He will come and save you.'

Then the eyes of the blind shall be opened,
and the ears of the deaf unstopped;
then shall the lame man leap like a deer,
and the tongue of the mute sing for joy.

For waters break forth in the wilderness,
and streams in the desert;
the burning sand shall become a pool,
and the thirsty ground springs of water

-- Isaiah 35: 3-7a

A voice cries:
'In the wilderness prepare the way of the Lord;
make straight in the desert a highway for our God.

Every valley shall be lifted up.
and every mountain and hill made low;
the uneven ground shall become level,
and the rough places a plain.

And the glory of the Lord shall be revealed,
and all flesh shall see it together,
for the mouth of the Lord has spoken.'

--Isaiah 40: 3-5

So they said to him, 'Who are you? We need to give an answer to those who sent us. What do you say about yourself?' He said, 'I am the voice of one crying out in the wilderness, "Make straight the way of the Lord," as the prophet Isaiah said.'

-- John 1:22,23