Let me go, for the day breaketh - Probably meaning, that as it was now morning, Jacob must rejoin his wives and children, and proceed on their journey. Though phantoms are supposed to disappear when the sun rises, that could be no reason in this case. Most of the angelic appearances mentioned in the Old and New Testaments took place in open day, which put their reality out of question.

Let me go.

Exodus 32:10 Now therefore let me alone, that my wrath may wax hot against them, and that I may consume them: and I will make of you a great nation.

Deuteronomy 9:14 Let me alone, that I may destroy them, and blot out their name from under heaven...

Songs 7:5 Your head on you is like Carmel, and the hair of your head like purple; the king is held in the galleries.

Isaiah 45:11 Thus said the LORD, the Holy One of Israel, and his Maker, Ask me of things to come concerning my sons...

Isaiah 64:7 And there is none that calls on your name, that stirs up himself to take hold of you: for you have hid your face from us...

Luke 24:28,29 And they drew near to the village, where they went: and he made as though he would have gone further...

I will not.

Songs 3:4 It was but a little that I passed from them, but I found him whom my soul loves: I held him, and would not let him go...

Hosea 12:4 Yes, he had power over the angel, and prevailed: he wept, and made supplication to him: he found him in Bethel...

Luke 18:1-7 And he spoke a parable to them to this end, that men ought always to pray, and not to faint...

Romans 8:37 No, in all these things we are more than conquerors through him that loved us.

1 Corinthians 15:58 Therefore, my beloved brothers, be you steadfast, unmovable, always abounding in the work of the Lord...

2 Corinthians 12:8,9 For this thing I sought the Lord thrice, that it might depart from me...

Hebrews 5:7 Who in the days of his flesh...

thou bless.

1 Chronicles 4:10 And Jabez called on the God of Israel, saying, Oh that you would bless me indeed, and enlarge my coast...

Psalm 67:1,6,7 God be merciful to us, and bless us; and cause his face to shine on us; Selah...

Psalm 115:12,13 The LORD has been mindful of us: he will bless us; he will bless the house of Israel; he will bless the house of Aaron...

Of the Name of God
Exod. iii. 13, 14.--"And Moses said unto God, Behold, when I come unto the children of Israel and shall say unto them, The God of your fathers hath sent me unto you and they shall say to me, What is his name? what shall I say unto them? And God said unto Moses, I AM THAT I AM and he said, Thus shalt thou say unto the children of Israel, I AM hath sent me unto you." We are now about this question, What God is. But who can answer it? Or, if answered, who can understand it? It should astonish us in …
Hugh Binning—The Works of the Rev. Hugh Binning

The Angel of the Lord in the Pentateuch, and the Book of Joshua.
The New Testament distinguishes between the hidden God and the revealed God--the Son or Logos--who is connected with the former by oneness of nature, and who from everlasting, and even at the creation itself, filled up the immeasurable distance between the Creator and the creation;--who has been the Mediator in all God's relations to the world;--who at all times, and even before He became man in Christ, has been the light of [Pg 116] the world,--and to whom, specially, was committed the direction …
Ernst Wilhelm Hengstenberg—Christology of the Old Testament

Meditations for the Morning.
1. Almighty God can, in the resurrection, as easily raise up thy body out of the grave, from the sleep of death, as he hath this morning wakened thee in thy bed, out of the sleep of nature. At the dawning of which resurrection day, Christ shall come to be glorified in his saints; and every one of the bodies of the thousands of his saints, being fashioned like unto his glorious body, shall shine as bright as the sun (2 Thess. i. 10; Jude, ver. 14; Phil. iii. 21; Luke ix. 31;) all the angels shining …
Lewis Bayly—The Practice of Piety