Everything in life needs balance. Your exercise regime is no exception to this rule. Intense workouts need to be followed by deep rest to help refill your energy levels otherwise you will find it difficult to progress.
During time between exercise sessions it is important to feed your body the right diet and get plenty of quality sleep. It is also important to listen to your body and act on the responses from each workout. Some days you may need to stretch more, other days you may have more stress and need to find ways to relax more.
Sticking to these rules will prevent you from burning out and help you stay injury free. It will also catapult you towards your goal quicker than the majority of other people who go to the gym.