^^^^^^^^^^^

He answered it. But i would like to add bigger weights + DIET = bigger muscles.
You have no idea how much i eat, especially on workout days.
And Pennywise, please don't call me sifu, there're plenty of other experienced members on this board too.

Anyway, general rule, if you're getting stronger but not growing, your routine is good but your diet sucks, if you're getting bigger but your lifts are stagnant, then a person's diet is good but the routine sucks. This is a GENERAL rule but not applicable to all situations.
I can easily tell you now that bodybuilding is 70% diet and 30% other factors. My friends on bb.com have repeatedly drilled this into my head. I've trained for many years and while i got pretty strong, my growth stagnated after i jumped from 55kg to 78kg.
After i started eating right, my lifts exploded and my bodyweight increased to 97kg. Fooooooooooooooooooooooooooooooooooooooooooooooood!