The darkness that is mixed with light in those who profess or possess salvation is the mental conception they put on the work God is doing. God can perform a work in you and if you put your own understanding on it, it turns to darkness for you and those about you. We must have the mind of God for every experience we face or leave it entirely in his hands, or that experience will become darkness and destruction to us.
It was made real to me at our last General Gathering in Kalamazoo that even the effort that we try to make in carrying on God's work is of no use unless produced by God himself. Our efforts and labors are all in vain. read Psalm 127:1 "Except the Lord build the house, they labour in vain that build it:" We can only wait for God to move.
You can be filled with the love of God and then try in your human effort and way to show that love to someone, but unless the Spirit is making an outward visible show of that love, you spoil it and it is of no worth.
God wants us to be completely controlled by him so that as Bro. Andrews has said even our smiles and handshakes will be by God alone. We know this is a work that is wrought in us by the Holy Spirit.
Yes, we may have to dip in Jordon more than seven times before we come out healed and the dipping is just obeying the spirit- full obedience to God so that we live in the Spirit and walk in the Spirit. Doing all to the Glory of God. I do thank him for his help to me.