How to Worship the God in Spirit
The Lord Jesus Christ said that the God is spirit:
24 God is a Spirit: and they that worship him must worship him in spirit and in truth. (John 4)
This saying means that spirits can work even in the material world or the human world, since the God created this material world where the human world belongs so that men can be in spirit as this saying means. And, the right way for human beings to connect to the God is through their spiritual power. To use the spiritual power, we have to become spiritual but not materialistic or human.
So, a man who does not pursue material riches and human honors, which are materialistic, can have more chances to use the spiritual power than in other cases. Therefor, a religious man such as a priest or a monk would choose to leave the material or the human world. While leaving the material or the human world, such a religious man should come to know spiritual power that gives him more insight into the human world, the material world, and the spiritual world. Accordingly, he would know truth of this world and the afterlife, knowing power of the God and strengthening their faith in the God.
But ordinary people who are absorbed in the material and human world cannot see such truth. Fish in water cannot know the world on the ground or in air. Therefore, to know power of the God, men should not be rich and seek for material happiness to satisfy their material desires. And, understanding power of the God means understanding truth of this material world and the human world as well as the spiritual world.
Indeed, the Lord Jesus Christ who knew power of the God knew truth of this material world and the human world as well as the spiritual world. In addition, He could use spiritual power, healing the sick and taking foods from nowhere, and even walking on the water.
The word "worship the God in spirit" means to worship the God with spiritual power. To worship the God with spiritual power means to worship the God from the bottom of the mind, invoking one's spiritual power, with a belief that that the the God is almighty and totally good. To invoke spiritual power, one has to concentrate one's mind on his soul, for which one has to know that he is made of a physical body and a soul. At the deepest part of one's mind, one can only find his soul that can use spiritual power.
So, the Lord Jesus Christ does not deny existence of the soul, spiritual power, the spirit world, etc. He should not deny spiritualism, either.
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Luke 2, King James Version
22 And when the days of her purification according to the law of Moses were accomplished, they brought him to Jerusalem, to present him to the Lord;
23 (As it is written in the law of the Lord, Every male that openeth the womb shall be called holy to the Lord;)
24 And to offer a sacrifice according to that which is said in the law of the Lord, A pair of turtledoves, or two young pigeons.
25 And, behold, there was a man in Jerusalem, whose name was Simeon; and the same man was just and devout, waiting for the consolation of Israel: and the Holy Ghost was upon him.
26 And it was revealed unto him by the Holy Ghost, that he should not see death, before he had seen the Lord's Christ.