The Son of Man 
We are so fortunate that the King James Bible translators, besides being God fearing Christians, were fluently conversant in the languages that they translated from; meaning that they spoke the languages concerned. There was no time wasting television or major world sport competitions to keep their minds occupied on worldly things, so they occupied themselves to the glory of God. 
If we believe that the King James Bible is the word of God, we can therefore use this knowledge that has been handed down, for our spiritual walk. 
There is therefore a difference in meaning between Son of man and son of man 
The Son of man is understood to be Jesus, not so. Indeed, He called Himself by that name. I never understood why. Son of God, yes; but why Son of man. Part of the answer was revealed this morning before home church, so let's have a look. 
I saw in the night visions, and, behold, one like the Son of man came with the clouds of heaven, and came to the Ancient of days, and they brought him near before him. And there was given him dominion, and glory, and a kingdom, that all people, nations, and languages, should serve him: his dominion is an everlasting dominion, which shall not pass away, and his kingdom that which shall not be destroyed. 
(Daniel 7:13-14)
But the saints of the most High shall take the kingdom, and possess the kingdom for ever, even for ever and ever. 
(Daniel 7:18)
Until the Ancient of days came, and judgment was given to the saints of the most High; and the time came that the saints possessed the kingdom. 
(Daniel 7:22)
And the kingdom and dominion, and the greatness of the kingdom under the whole heaven, shall be given to the people of the saints of the most High, whose kingdom is an everlasting kingdom, and all dominions shall serve and obey him. 
(Daniel 7:27)
This sounds very much like the New Covenant, not so. 
Immediately after the tribulation of those days shall the sun be darkened, and the moon shall not give her light, and the stars shall fall from heaven, and the powers of the heavens shall be shaken: And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory. And he shall send his angels with a great sound of a trumpet, and they shall gather together his elect from the four winds, from one end of heaven to the other. 
(Matthew 24:29-31)

From this and other passages in the Bible we understand that Jesus Christ is known as the Son of man. 
And lo a voice from heaven, saying, This is my beloved Son, in whom I am well pleased. 
(Matthew 3:17)
But when they persecute you in this city, flee ye into another: for verily I say unto you, Ye shall not have gone over the cities of Israel, till the Son of man be come. 
(Matthew 10:23)
For as Jonas was three days and three nights in the whale's belly; so shall the Son of man be three days and three nights in the heart of the earth. 
(Matthew 12:40)
But what does it mean? 
A clue comes from a seemingly mysterious verse that appears to mean that we were chosen by God's will and not by our own: 
Which were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God. 
(John 1:13)
However, the explanation is in the preceding verse: 
But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name: 
(John 1:12)
This means that if we receive Him, the True Light, as Saviour, it is God's will that we shall receive power to become the sons of God. 
Put another way: God has decreed that those of us who receive Jesus Christ as Lord, shall at a future date have the power to become His sons. 
Daniel called them (us?) the saints of the most High. 
In other words, Jesus Christ is God's Son in charge of mankind; He is God's Son of man. 
Here is confirmation:
Then answered Jesus and said unto them, Verily, verily, I say unto you, The Son can do nothing of himself, but what he seeth the Father do: for what things soever he doeth, these also doeth the Son likewise. For the Father loveth the Son, and sheweth him all things that himself doeth: and he will shew him greater works than these, that ye may marvel. For as the Father raiseth up the dead, and quickeneth them; even so the Son quickeneth whom he will. For the Father judgeth no man, but hath committed all judgment unto the Son: That all men should honour the Son, even as they honour the Father. He that honoureth not the Son honoureth not the Father which hath sent him. Verily, verily, I say unto you, He that heareth my word, and believeth on him that sent me, hath everlasting life, and shall not come into condemnation; but is passed from death unto life. Verily, verily, I say unto you, The hour is coming, and now is, when the dead shall hear the voice of the Son of God: and they that hear shall live. For as the Father hath life in himself; so hath he given to the Son to have life in himself; And hath given him authority to execute judgment also, because he is the Son of man. Marvel not at this: for the hour is coming, in the which all that are in the graves shall hear his voice, And shall come forth; they that have done good, unto the resurrection of life; and they that have done evil, unto the resurrection of damnation. I can of mine own self do nothing: as I hear, I judge: and my judgment is just; because I seek not mine own will, but the will of the Father which hath sent me. If I bear witness of myself, my witness is not true. 
(John 5:19-31)
How does our Lord do this? 
By His finished work on the cross. 
From reading Heart of the Gospel we understand something of the Blood Covenant and that the Lord Jesus Christ is our Covenant Representative. By being our Representative, our Redeemer, He is known as the Son of man. The Son through whom man can be saved from Adam's death. 
Having therefore, brethren, boldness to enter into the holiest by the blood of Jesus, By a new and living way, which he hath consecrated for us, through the veil, that is to say, his flesh; And having an high priest over the house of God; 
(Hebrews 10:19-21)
Of how much sorer punishment, suppose ye, shall he be thought worthy, who hath trodden under foot the Son of God, and hath counted the blood of the covenant, wherewith he was sanctified, an unholy thing, and hath done despite unto the Spirit of grace? 
(Hebrews 10:29)