The Lord Jesus came to earth to present the Kingdom of Heaven to the Jews (as promised throughout the Old Testament. And His followers were expecting Him to over throw the Romans and set up this kingdom. But He had to keep warning them NOT YET, there were things that had to be fulfilled first:
Matthew 16:9 Do ye not yet understand, neither remember the five loaves of the five thousand, and how many baskets ye took up?
Matthew 24:6 And ye shall hear of wars and rumours of wars: see that ye be not troubled: for all these things must come to pass, but the end is not yet.
Mark 8:17 And when Jesus knew it, he saith unto them, Why reason ye, because ye have no bread? perceive ye not yet, neither understand? have ye your heart yet hardened?
Mark 11:13 And seeing a fig tree afar off having leaves, he came, if haply he might find any thing thereon: and when he came to it, he found nothing but leaves; for the time of figs was not yet.
John 2:4 Jesus saith unto her, Woman, what have I to do with thee? mine hour is not yet come.
John 7:6 Then Jesus said unto them, My time is not yet come: but your time is alway ready.
John 7:8 Go ye up unto this feast: I go not up yet unto this feast: for my time is not yet full come.
John 7:30 Then they sought to take him: but no man laid hands on him, because his hour was not yet come.
John 7:39 (But this spake he of the Spirit, which they that believe on him should receive: for the Holy Ghost was not yet given; because that Jesus was not yet glorified.)
John 8:20 These words spake Jesus in the treasury, as he taught in the temple: and no man laid hands on him; for his hour was not yet come.
John 20:17 Jesus saith unto her, Touch me not; for I am not yet ascended to my Father: but go to my brethren, and say unto them, I ascend unto my Father, and your Father; and to my God, and your God.
1 John 3:2 Beloved, now are we the sons of God, and it doth not yet appear what we shall be: but we know that, when he shall appear, we shall be like him; for we shall see him as he is.
The Apostle Paul writing to the Jewish believers continued to tell them NOT YET:
Hebrews 2:8 Thou hast put all things in subjection under his feet. For in that he put all in subjection under him, he left nothing that is not put under him. But now we see not yet all things put under him.
Hebrews 9:8 The Holy Ghost this signifying, that the way into the holiest of all was not yet made manifest, while as the first tabernacle was yet standing:
Hebrews 12:4 Ye have not yet resisted unto blood, striving against sin.
And even today as we are “Looking for that blessed hope, and the glorious appearing of the great God and our Saviour Jesus Christ; (Titus 2:13)” We need to remember , though everything has been fulfilled, it’s NOT YET, but Soon!