"All Americans owe a debt of gratitude to Dr. King for his bravery and commitment to civil rights and nonviolence that changed this nation - and world - for the better"

"At times our own light goes out and is rekindled by a spark from another person. Each of us has cause to think with deep gratitude of those who have lighted the flame within us"

"Next to ingratitude the most painful thing to bear is gratitude"

"Gratitude is a sickness suffered by dogs"

"Gratitude is one of those things that cannot be bought. It must be born with men, or else all the obligations in the world will not create it"

"Gratitude makes sense of our past, brings peace for today, and creates a vision for tomorrow"

"The essence of all beautiful art, all great art, is gratitude"

"There are slavish souls who carry their appreciation for favors done them so far that they strangle themselves with the rope of gratitude"

"If future generations are to remember us more with gratitude than sorrow, we must achieve more than just the miracles of technology. We must also leave them a glimpse of the world as it was created, not just as it looked when we got through with it"

"There are minds so impatient of inferiority that their gratitude is a species of revenge, and they return benefits, not because recompense is a pleasure, but because obligation is a pain"

"Gratitude is merely the secret hope of further favors"