Welcome to the conversation. Appreciate your joining in. In Him -LonStill not answering what we should be doing. "living in accordance with the will of God" is a bit too vague. Please expand on this. For example, a Muslim lives according to the will of God by slamming a jumbo jet into a crowded building. I don't think this is what you mean, but I'd rather not guess.
Expanding on the first may give a little more meaning to the second part - "grow in spirit and understanding to partake in the finality of his plan".