The quotes are from series 4 to series 7. The full list is available at the Criminal Minds wiki page here.
"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
"Men are more ready to repay an injury than a benefit, because gratitude is a burden and revenge a pleasure." - Tacitus
"Anything you cannot relinquish when it has outlived its usefulness, possesses you. And in this materialistic age, a great many of us are possessed by our possessions." - Mildred Listette Norman
"Experience is a brutal teacher, but you learn. My God, do you learn." - C.S. Lewis
"A family is a place where minds come in contact with one another. If these minds love one another, the home will be as beautiful as a flower garden. But if these minds get out of harmony with one other it is like a storm that plays havoc with the garden." - Budhha
"We all wear masks and the time comes when we cannot remove them without removing our own skin." - André Berthiaume
“Love feels no burden, thinks nothing of its trouble, attempts what is above its strength, pleads no excuse for impossibility, for it thinks all things are lawful for itself and all things are possible.” - Thomas A. Kempis
"What lies in our power to do, lies in our power not to do." - Aristotle
