God's mind is absolutely undivided. In practical application, this means that His sovereignty can never be separated from His love; His grace cannot be separated from His omniscience; His judgment cannot be separated from either His mercy or His wrath. God is absolutely constant because His faithful providence cannot be separated from any other of His attributes. God is whole and complete. Under every circumstance, He is never confused or uncertain about what to do. He is always headed in the same direction, which is to complete His purpose.
It is absolutely impossible for Him to do anything that is not wise and at the same time loving. It is He who tells us how to live and how to be like Him. What God is has awesome ramifications for us because we are so different, and He wants us to be like Him, to be one with Him, to be whole, to be complete, to be undivided in mind like Him.
There are problems here because becoming this way requires a measure of cooperation from us. Compared to God, our mind is all over the place, and thus we are so easily distracted from our focus.
John W. Ritenbaugh
Other Forerunner Commentary entries containing Hebrews 13:8:
2 Timothy 2:11-13
2 Peter 1:19-21