You are part of the world's most feared and trusted force. Engage your brain before you engage your weapon.
Source: 2003 letter from Mattis
The most important six inches on the battlefield is between your ears.
Source: San Diego Union Tribune
If in order to kill the enemy you have to kill an innocent, don’t take the shot. Don’t create more enemies than you take out by some immoral act.
Source: San Diego Union Tribune
You cannot allow any of your people to avoid the brutal facts. If they start living in a dream world, it’s going to be bad.
Source: San Diego Union Tribune
I don’t lose any sleep at night over the potential for failure. I cannot even spell the word.
Source: San Diego Union Tribune
"For the mission's sake, for our country's sake, and the sake of the men who carried the Division's colors in past battles — carry out your mission and keep your honor clean. Demonstrate to the world there is 'No Better Friend — No Worse Enemy' than a US Marine.
Source: 2003 letter from Mattis
There are hunters and there are victims. By your discipline, you will decide if you are a hunter or a victim.
I come in peace. I didn't bring artillery. But I’m pleading with you, with tears in my eyes: If you f--k with me, I’ll kill you all.
Source: San Diego Union Tribune