I never read the bio of any American presidents, but I did read the collected writings of Abraham Lincoln and Thomas Jefferson, probably America's two most eloquent presidents. There is a famous poem Lincoln is said to have written to a mother who had lost 5 of her sons as soldiers in the Civil War, if I remember correctly.

Most have not read it, so I will copy it here:

"Dear Madam,

I have been shown in the files of the War Department a statement of the Adjutant General of Massachusetts that you are the mother of five sons who have died gloriously on the field of battle. I feel how weak and fruitless must be any word of mine which should attempt to beguile you from the grief of a loss so overwhelming. But I cannot refrain from tendering you the consolation that may be found in the thanks of the Republic they died to save. I pray that our Heavenly Father may assuage the anguish of your bereavement, and leave you only the cherished memory of the loved and lost, and the solemn pride that must be yours to have laid so costly a sacrifice upon the altar of freedom.

Yours, very sincerely and respectfully,

A. Lincoln"