As is stated, God grows through his children, and through carrying out his work and glory, to bring us up to be as He.
Although God is perfect and able to do all, except sin, and knows and has all power over all his creations and children, He still grows. To say otherwise is to try to limit Him.
Let’s face it, we all grow and change throughout all the eons and eternal lives we go through throughout all the eternities. Once we’ve finished our cycle of the current eternal life, of pre-mortal, mortal and post-mortal, we are then called up to the next larger, more powerful, bigger and better phase of existence.
What awaits us then? Another premortal, mortal and postmortal existence, only on a much larger scale. With the extremes being extended, both the good and bad, and the inherent, endowed ability of a higher form of entity, than is presently attainable in our current eternal life.
To focus more on our current state, we are all in the progression of life in the present, past and future, and what we do impacts the future, just as our past has effected our present. However, did you know that our future also effects our present? It does! It goes both ways, back and forth, ’round and ’round again, as we roll up the progressive “hill” of advancement in eternal lives.
There’s more, but it cannot be written, be it forbidden.