Allways keep your target in mind. Everytime you feel like giving up remind yourself where you started and where you wanna go and what does it take to get there.
quiting is throwing away everything you accompilshed till now..All those workouts all that pain and damn food..Quiting means all you've done till now was a waste of time.
Think about each meal each workout as another step towrds your target..
When you drive your car to a long distance You dont stop the car in the middle of the road and just go home telling yourself "The hell with this...I have alot to go...I rather turn and go home"
Also you can cheat now and then...Once a week...Once every ten days...But dont go crazy and eat a hole pizza and drink 5 gallons of coke
Stay focused Remember you target

good luck!