How does a person forgive someone living or be sure that they fully forgave someone who is now dead ?
Forgiving completely with no grudging or bitteness left, and with the void where bitterness used to be, filled with (agape, agapous, philio from God ), is a salvation issue. So to forgive is to enter into one of the conditions of entering into salvation.
The work of gaining salvation is one of copartnership, a joint operation. There is to be co-operation between God and the repentant sinner. This is necessary for the formation of right principles in the character. Man is to make earnest efforts to overcome that which hinders him from attaining to perfection. But he is wholly dependent upon God for success. Human effort of itself is not sufficient. Without the aid of divine power it avails nothing. God works and man works. Resistance of temptation must come from man, who must draw his power from God. On the one side there is infinite wisdom, compassion, and power; on the other, weakness, sinfulness, absolute helplessness. {AA 482.2}
God wishes us to have the mastery over ourselves. But He cannot help us without our consent and co-operation. The divine Spirit works through the powers and faculties given to man. Of ourselves, we are not able to bring the purposes and desires and inclinations into harmony with the will of God; but if we are "willing to be made willing," the Saviour will accomplish this for us, "Casting down imaginations, and every high thing that exalteth itself against the knowledge of God, and bringing into captivity every thought to the obedience of Christ." 2 Corinthians 10:5. {AA 482.3}
1. Divine absolute - Jeremiah 29:13 And ye shall seek me, and find me, when ye shall search for me with all your heart. Pray for something over and over day by day till you want it more than anything else, and claim this promise, deciding to trust that God keeps his promises.
2. Ask to be made willing, for God to make you willing to forgive and accept His agape, agapous, philio implanted in your heart for this person to replace any and all bitterness even if this person never is trustworthy. He did for the man whose lack of belief was stopping Jesus from rescuing his afflicted son, what the man asked in helplessness and faith that took God at His word and being unable to force himself to feel faith, he begs God to step in and add His own power, to his best human efforts, and make that tiny faith enough because put His finger to move the prevously unmoving . Mark 9:17-29 (Jesus used HIs own faith, prayer, fasting to answer the man's need and helpless but trusting cry for help.) Read Thoughts from the Mount of Blessing p-141-144.
3. Forgiveness and the (Love - Agape<26>, Agapous<25>, Philio<5384>) from God are both gifts from inside His heart / mind and humans can not create or originate them, but we can ask for them to be implanted and developed within us, and ask Him to help us co-operate with His work of putting us in position to receive those gifts and obtain their work inside us, and choose to attempt to live them out in our lives as He teaches , leads, empowers us to. God will make sure you love and have mercy and forgive - enough that it will satisfy His requirements, because He will give you as much love, mervy, forgiveness as He implanted in the human nature of Jesus, as much as you can hold each day in your own humanity. Then act as thoiugh you have forgiven and God will change the feeling to match your decision to trust God to make it happen inside you. Jordan didn't stop till the priest's feet got wet. read Acts 5:31-32; John 12: 23, 26; James 1:25
Christ will never abandon the soul for whom He has died. The soul may leave Him and be overwhelmed with temptation, but Christ can never turn from one for whom He has paid the ransom of His own life. Could our spiritual vision be quickened, we should see souls bowed under oppression and burdened with grief, pressed as a cart beneath sheaves and ready to die in discouragement. We should see angels flying swiftly to aid these tempted ones, who are standing as on the brink of a precipice. The angels from heaven force back the hosts of evil that encompass these souls, and guide them to plant their feet on the sure foundation. The battles waging between the two armies are as real as those fought by the armies of this world, and on the issue of the spiritual conflict eternal destinies depend. {MB 118.4}