Luke 17:22 And he said unto the disciples, The days will come, when ye shall desire to see one of the days of the Son of man, and ye shall not see it.
Jesus and the kingdom presence was with them. The Pharisees did not acknowledge that Jesus, the son of man, the son of King David, was Lord. Perilous times were coming and they would long to see his goodness and grace. but because of unbelief he would not be seen. He is seen within the hearts of those who believe in him.
Luke 17:23 And they shall say to you, See here; or, see there: go not after them, nor follow them.
Many will claim to see Jesus or the Messiah, but they are false. Do not follow false messiahs.
Mat 24:23 Then if any man shall say unto you, Lo, here is Christ, or there; believe it not.
Mat 24:24 For there shall arise false Christs, and false prophets, and shall show great signs and wonders; insomuch that, if it were possible, they shall deceive the very elect.
Luke 17:24 For as the lightning, that lighteneth out of the one part under heaven, shineth unto the other part under heaven; so shall also the Son of man be in his day.
The return of Jesus will be seen by all, just as lightning that flashes across the sky is seen by all. This is despite what some groups like the Jehovah's Witnesses say - that Jesus returned "secretly" in 1915. (Guzik)
Luke 17:25 But first must he suffer many things, and be rejected of this generation.
No one can enter the kingdom without the cross of Jesus. Jesus must first suffer many things and shed his blood on the cross. Those who only seek Jehovah for the kingdom, must first seek His Son Jesus. Jesus is the entrance to the Kingdom of God. The Jews who rejected him also rejected the way to God the Father and the eternal kingdom. Pray for the salvation of the Jews.
John 14:6 Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me.