I've found a card. It was really hard to find one. Because "get well soon" isn't appropriate, nor is a sympathy card since he's still alive. The card that I found says:

When you draw close to God...
with your faith,
with your prayers,
with your heart...
God will draw close to you.
with His protection,
with His guidance,
with His love.
James 4:8

Then the inside says:
Listen for His voice,
rest in His love,
and know all is well
in His hands.

I just don't know what to write in it. My mind is so blank. I cannot imagine how his wife must feel right now.