Who follows Me?

"Then Jesus spoke to them again, saying, 'I am the light of the world. He who follows Me shall not walk in darkness, but have the light of life.'" John 8.12

Walking in the Light is living with a clear conscience, detoxified of any impurity of this evil world. It is to live at peace with oneself and especially with the Holy Spirit.
Living in darkness is to be subject to the immorality imposed by the corrupting society.

To trust vs. To believe

"He who believes in Me, as the Scripture has said, out of his heart will flow rivers of living water." John 7.38

When you believe in Jesus according to the Scripture, the Holy Spirit must flow. If the Holy Spirit is not flowing, it is because there is no trust, but mere belief.

Believing is like the dating period where there is no commitment from either party. But trust relates to marriage, where both parties commit themselves to one another for the rest of their lives.

Most Christians think they trust when in reality they simply believe.

Invitation

"...but whoever drinks of the water that I shall give him will never thirst. But the water that I shall give him will become in him a fountain of water springing up into everlasting life.” John 4.14

Typically, invitations are made for special people. But this invitation is for all, without exception. Even you who are reading this word. No matter what your sinful past has been, as long as you accept the invitation and surrender to Jesus. Join the Fast of Daniel from this 13/8 and be satisfied forever.

Fleshly world vs. Spiritual world

"But you are not in the flesh but in the Spirit, if indeed the Spirit of God dwells in you. Now if anyone does not have the Spirit of Christ, he is not His." Romans 8.9

Being in the flesh is to be a prisoner of the heart, to cater to the lusts of the soul and feelings.
Being in the Spirit is to live in the spiritual world, the world of certainty, the conviction and of supernatural faith.
If anyone confesses Jesus as Lord but does not live by faith, he has nothing to do with him.

You must be spirit

"God is Spirit, and those who worship Him must worship in spirit and truth.” John 4.24

Because of His holy nature, God rejects the worship of those who DO NOT have the same divine nature.
How could those who are born of the blood, the will of the flesh or the will of man express sublime and profound praises to Someone who is Spirit? Is it possible for the flesh to worship in spirit?
To worship in spirit, you must be born of the Spirit. You must have His DNA, His nature, in other words, you MUST BE SPIRIT!

The letter kills

"...who also made us sufficient as ministers of the new covenant, not of the letter but of the Spirit; for the letter kills, but the Spirit gives life." 2 Corinthians 3.6

The true servants of the Holy Spirit of God transmit Spirit to those who are thirsty for the Spirit.
The other "servants" are concerned with imparting empty knowledge of life that imposes deadly burdens. One must be born of the Spirit to have this discernment. 

He will teach you

"But the Helper, the Holy Spirit, whom the Father will send in My name, He will teach you all things, and bring to your remembrance all things that I said to you." John 14.26

The seal of the Holy Spirit guarantees two things: to teach and to remind. To teach the behaviour according to the character of God and to remind the words of the Lord Jesus, to keep the faith alive until His return.
In short: God carefully guides His children so that they are not influenced by anyone.