I always just motivate my self. I want to look visibly better than the next guy. I compete, so I always tell myself that I'm doing this to annihilate the competition, and this fish and vegetables, will help me to do that. I will have striated hams and everything else, while the guys to my left and right, may have cheated a couple times or skipped a few cardio sessions. Always think of the other guys. Do what they are not willing to do, be more strict with yourself than they are, train harder than they do, push yourself to the absolute physical limits past what you thought you were able to. Do everything in your power to look the best you possibly can, with no regrets, no ifs, no buts. If you can say even one time during your diet, that you should have or could have done anything different than what you did, to get shredded, then you fucked up. Its your own fault you did not succeed.
Now, if you're not competing, say you just want to get ready for the beach, tell yourself that you are going to be the leanest and most crazy looking mother fucker on that beach. The other guys won't even compare to you. Every girl who sees you will be amazed with your 8 pack and striated chest. They will all be secretly staring at you and raping you with their eyes, while their lame ass jersey shore wannabe boyfriend is lying there with them in the sand. GET FUCKING SHREDDED!!!!!!!