When Jesus was speaking to His disciples, He was speaking to men that believe in God. They knew God is a Spirit. They knew God as their Heavenly Father. They knew there is only one God. (John 4:24, Isaiah 64:8, Malachi 2:10, Deuteronomy 6:4)

Jesus had been with these men for quite some time. They had seen His miracles. They had seen Him raise the dead, open blind eyes, heal the sick, cleanse the leper, multiply fish and loaves, even command the wind and seas and they obeyed Him. They even saw Him walk on water.

Yet, they were still having trouble grasp that this man Jesus, that grew tired, hungry, and thirsty, was their Heavenly Father in a human body. (John 1:1, 14)

It appears that in His attempt to bridge the span of their understanding, Jesus used language to transition His disciples thinking to understand He is the Almighty God operating within a human body. The invisible God was now revealed. (John 1:18)

"Jesus cried and said, He that believeth on me, believeth not on me, but on him that sent me. And he that seeth me seeth him that sent me." - John 12:44-45 KJV

"For I have not spoken of myself; but the Father which sent me, he gave me a commandment, what I should say, and what I should speak. And I know that his commandment is life everlasting: whatsoever I speak therefore, even as the Father said unto me, so I speak." - John 12:49-50 KJV

Jesus communicated that He is a man, but at the same time the Spirit of God is within Him. He was letting His disciples know, His body/flesh is the image of their Heavenly Father. (Colossians 1:15, 2Corinthians 4:4-6)

Jesus said to Thomas,

"If ye had known me, ye should have known my Father also: and from henceforth ye know him, and have seen him." - John 14:7 KJV

"Philip saith unto him, Lord, shew us the Father, and it sufficeth us.

“Jesus saith unto him, Have I been so long time with you, and yet hast thou not known me, Philip? he that hath seen me hath seen the Father; and how sayest thou then, Shew us the Father?" - John 14:8-9 KJV

Jesus let them know that the words He spoke was God speaking to them, for God is in Him. (2Corinthians 5:19)

He reminded them of all the works that He had done that only God can do.

"Believest thou not that I am in the Father, and the Father in me? the words that I speak unto you I speak not of myself: but the Father that dwelleth in me, he doeth the works. Believe me that I am in the Father, and the Father in me: or else believe me for the very works' sake." - John 14:10-11 KJV

Then later Jesus told His disciples,

"He that hateth me hateth my Father also. If I had not done among them the works which none other man did, they had not had sin: but now have they both seen and hated both me and my Father." - John 15:23-24 KJV

Jesus let them know,

"I said therefore unto you, that ye shall die in your sins: for if ye believe not that I am he, ye shall die in your sins. ... They understood not that he spake to them of the Father." - John 8:24, 27 KJV (Exodus 3:14)