Jackson said, when this was read to him,

"Better that ten Jacksons should fall than one Lee."

Afterward, when it was reported that Jackson was doing well, General
Lee playfully sent him word:

"You are better off than I am, for while you have only lost your LEFT,
I have lost my RIGHT arm."

Then, hearing that he was worse, he said:

"Tell him that I am praying for him as I believe I have never prayed
for myself."

After his death, General Lee writes to my mother, on May 11th:

"...In addition to the deaths of officers and friends consequent upon
the late battles, you will see that we have to mourn the loss of the
great and good Jackson. Any victory would be dear at such a price.
His remains go to Richmond to-day. I know not how to replace him.
God's will be done! I trust He will raise up some one in his place...."

Jones, in his Memoirs, says: "To one of his officers, after Jackson's
death, he [General Lee] said: 'I had such implicit confidence in
Jackson's skill and energy that I never troubled myself to give him
detailed instructions. The most general suggestions were all that he
needed.'"