In-depth knowledge of the Bible make us to understand that the minimum acceptable experience of Jesus Christ which Jesus  expects is that people should become his disciples.

We can understand this when a young rich ruler went to see him in secret in the night. The man Nicodemus was a believer interested in Jesus's teachings but Jesus challenged him that he has to be born again

Nicodemus did not understand. It didn't surprise Jesus because for you to understand him you must maintain a continuous relationship with him.

You cannot come in one night and understand all about Jesus.

Apart from Nicodemus other people sorted after him like the Multitudes but he told them that they come to him only because of the bread he can miraculously provide for them and are not interested in His teachings.

A relationship that behaves like the multitude cannot reap much benefits from Jesus Christ.

Nicodemus was a believer but Jesus was telling Nicodemus and other ordinary believers that it is not enough to be just a believer. But that people must have a relationship like master and disciples with him. 

So what did he tell the disciples when they asked him why he spoke to them plainly while he spoke to others who were not disciples in parables.

He said to them, "to you it is given to know the mysteries of the kingdom of heaven. The kingdom of God is a mystery and parables only heightened its mystery.

So if you want Jesus to speak plainly to you the mystery of the kingdom , you must be his disciple.

His disciples are interested in going to heaven which is the major interest of Jesus Christ.

Jesus's interest in a believer is minimal unless that believer has  a desire and not just an interest in going to heaven and that desire is on a daily basis.

Whosoever is interested in going to heaven must has a special interest in Jesus Christ because only through him can anyone make it to heaven.

You can't just be a believer in Jesus Christ you must believe in him for heaven.

Yes he can give you money, success, safety, healing etc but what he wants to give is assurance that you are on your way to heaven because if you have all those things and you don't have the assurance of heaven then you have nothing .

It now depends on what you want, those who want assurance of heaven must walk permanently with him as his disciples.

The secrets of the kingdom of heaven are revealed only to the disciples.