It comes down to trusting in God to be a fair judge.

What is the root for the need for forgiveness? Either from God, from fellow man/woman, or from ourselves? How do we come to a true forgiveness?

I would posit that the root is fear. Much of Scripture speaks against fear, and speaks towards true love casting out fear. When someone is forgiven, they no longer are in fear of consequences/reactions of a specific action.

Psalm 112 (ASV)
"....The righteous shall be had in everlasting remembrance. He shall not be afraid of evil tidings: His heart is fixed, trusting in Jehovah. His heart is established, he shall not be afraid, ....he hath given to the needy...."

Romans 3:15-18 (ASV)
"Their feet are swift to shed blood; Destruction and misery are in their ways; And the way of peace have they not known: There is no fear of God before their eyes."

Romans 13:3 (ASV)
"And wouldest thou have no fear...? Do that which is good..."

1 John 4:18 (ASV)
"There is no fear in love: but perfect love casteth out fear, because fear hath punishment; and he that feareth is not made perfect in love."

one of the instances I refer to, the person in the instance was a sweet girl, a poet... a rare breed perhaps.

suddenly flips out and starts throwing tables around at a coffee house, tables larger than her.



judge not lest ye be judged.

<What is spirit?>

Spirits are the words we speak, the ideas that hold us, or that we hold consider the following:

Jhn 6:63 It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, [they] are spirit, and [they] are life.

<Do you believe that all angels are spirits? >

the term angel in the bible literally means messenger of God. There are Angels which are spirit, and their are angels which come from the heavens and are physical, the Elohim, which can also be called aliens or ET's. And there are angels that are normal people delivering a message from God. Paul and others encountered angels that were spirit in visions and dreams. Abraham encountered a physical angel and wrestled with him, also the elohim where physical beings that reproduced with humans on earth. When ever the holy spirt speaks
through a person that person is being an angel.

<When people die, are they then spirit (ie, ghosts)? >

When people die, the only thing that remains is the spirit.

<Is God spirit?>
God is more then spirit, but one does error in say that he is, even Jesus did:
Jhn 4:24 God [is] a Spirit: and they that worship him must worship [him] in spirit and in truth.

< Is there a difference between the Holy Spirit and God - since it is said that the Holy Spirit is God's spirit? >
The Holy spirit is that portion of God that we know, it is not all that God is. It is the word of God delivered to us through the teachings of Jesus and the scripture. We are filled with the holy spirit when we hear the word of God and believe it. Consider these verses:

Luk 8:11 ¶ Now the parable is this: The seed is the word of God.
Luk 8:12 Those by the way side are they that hear; then cometh the devil, and taketh away the word out of their hearts, lest they should believe and be saved.
Luk 8:13 They on the rock [are they], which, when they hear, receive the word with joy; and these have no root, which for a while believe, and in time of temptation fall away.
Luk 8:14 And that which fell among thorns are they, which, when they have heard, go forth, and are choked with cares and riches and pleasures of [this] life, and bring no fruit to perfection.
Luk 8:15 But that on the good ground are they, which in an honest and good heart, having heard the word, keep [it], and bring forth fruit with patience.

The words themselves are not spirit, but when they are accepted and believed do they become spirit, and bare fruit which is love, peace and long suffering.

<And I don't think that when humans die, that they are then of the same essence as angels. When we die, we exist in the grave/sheol until the resurrection. Angels are not dead and travel - though some are bound.
>

The teaching of Jesus is that the dead sleep, whether they are of spirit yet or not is a matter of debate. According to Corrinthians that spiritual body does not exist until the ressurection:

1Cr 15:42 So also [is] the resurrection of the dead. It is sown in corruption; it is raised in incorruption:
1Cr 15:43 It is sown in dishonour; it is raised in glory: it is sown in weakness; it is raised in power:
1Cr 15:44 It is sown a natural body; it is raised a spiritual body. There is a natural body, and there is a spiritual body.

I would argue that what we as Christians have is a developing spirit that is born of the holy spirit. In death the development of this spirit is quickened and fully realized. Other people in the world have a spirit that is not born of the holy spirit and is mortal. In the second death their spirit is consumed in the lake of fire and they cease to exist forever. Consider these verses:

Jhn 3:5 Jesus answered, Verily, verily, I say unto thee, Except a man be born of water and [of] the Spirit, he cannot enter into the kingdom of God.
Jhn 3:6 That which is born of the flesh is flesh; and that which is born of the Spirit is spirit.
Jhn 3:7 Marvel not that I said unto thee, Ye must be born again.

__________

1Cr 15:35 ¶ But some [man] will say, How are the dead raised up? and with what body do they come?
1Cr 15:36 [Thou] fool, that which thou sowest is not quickened, except it die: