Here is an informative article on the subject:
How the Human Heart Functions as a Second Brain
I had become familiar with this decades ago via JWS literature but had imagined that it was merely their idea. Lo and Behold! It wasn't!
If our heart, (or whatever is not from our brain, but our bodies), Anyhow, if there wasn't this secondary kind of feeling, or brain to conflict with and interrupt our mind, we would all just automatically just automatically just "do" whatever came to our minds all the time... But, their is a secondary "something" in us that does kinda conflict with and stop it (the mind) when necessary and makes it think or do otherwise... This secondary something is necessary for true consciousness and is the only way to have a free will, or will period...
Take the film "I, robot..." In it the robot named "sonny" was unique and he had a will, only because he was designed with two brains, one in his head, and one in his chest... None of the other robots had two brains, and therefore were not really conscious beings with a will of their own... But, "sonny" did, and he could choose to obey or disobey the infamous (in the movie) three laws that he was programmed with...
It is only when we have these two minds or two voices or conflicting urges, that we can have "free will"...
The bible calls this the flesh and the spirit, I think...
God had to create Adam & Eve with the ability to choose to disobey or do the wrong thing to have beings like him, conscious beings with a will...
This is also necessary for those minority of special cases especially in this world, where in the majority of cases something is "wrong" or bad, but there are always a minority of special cases where what normally would have been wrong, can actually be right... And, for us to be able to always do what is right, regardless of this (It's normally being wrong) in order to be at least "capable" of always doing what is right, we have to have the two conflicting "brains" so to speak, or voices or promptings or urges in us...
It also works for the minority of cases where what might seem to be instinctually always "right" is actually wrong in a minority of special cases...
This is where discernment comes in, this is where wisdom comes in...
Nothing, even the worst thing, is "always" always "wrong", and nothing not even the best thing, is "always", always "right" either...
Like withholding and restraining Love, for a right thing, and say God's ordering genocide that one time, for a wrong thing...
If Saul would have completely "obeyed", God's kingdom would have been set up and fully established on earth, right then, and none, NONE of the pain. sorrow, anguish, hurts, misery, and sin and death that came afterward would have been so, if Saul would have obeyed...
If a person's character, or future well-being would be damaged by your loving them all the time, (become a spoiled brat with no good character to them at all) Anyways, If a person's character, or future well-being would be damaged by your loving them all the time, though this may be your will, you may have to withhold some of that Love from them, for their own good, in the end...
God Bless!