I used to drink Diet Pepsi. I drank a lot of that and little water. Now, I drink mostly water. I consume less liquids. I am less thirsty. The physical reasons for this are obvious.
Less obvious is that this same principle applies to thoughts. When your thoughts are of value to spirit, mind and heart you need less of them. The mind does not restlessly seek satisfaction. The mind is calm.
A calm satisfied mind does stronger magick.