The Promise of the Holy Spirit
It is the Holy Spirit which guides us into all spiritual truth.
Just before Jesus was crucified, He promised His disciples that when He went back to Heaven to mediate on our behalf, He would send someone else to be a comforter to His followers.
John 14:16-18 KJV
(16) And I will pray the Father, and he shall give you another Comforter, that he may abide with you forever;
(17) Even the Spirit of truth; whom the world cannot receive, because it seeth him not, neither knoweth him: but ye know him; for he dwelleth with you, and shall be in you.
(18) I will not leave you comfortless: I will come to you.
The Holy Spirit is given to all believers as we ask for power, strengthen and guidance. Jesus has promised that whatsoever we ask in His name and in accordance with His Will, will be done.
John 14:11-14 KJV
(11) Believe me that I am in the Father, and the Father in me: or else believe me for the very works' sake.
(12) Verily, verily, I say unto you, He that believeth on me, the works that I do shall he do also; and greater works than these shall he do; because I go unto my Father.
(13) And whatsoever ye shall ask in my name, that will I do, that the Father may be glorified in the Son.
(14) If ye shall ask any thing in my name, I will do it.
We receive the gift of the Holy Spirit once we believe on the Lord Jesus Christ:
John 7:37-39 KJV
(37) In the last day, that great day of the feast, Jesus stood and cried, saying, If any man thirst, let him come unto me, and drink.
(38) He that believeth on me, as the Scripture hath said, out of his belly shall flow rivers of living water.
(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.)
Ephesians 1:13-23 KJV
(13) In whom ye also trusted, after that ye heard the word of truth, the gospel of your salvation: in whom also after that ye believed, ye were sealed with that Holy Spirit of promise,
(14) Which is the earnest of our inheritance until the redemption of the purchased possession, unto the praise of his glory.
(15) Wherefore I also, after I heard of your faith in the Lord Jesus, and love unto all the saints,
(16) Cease not to give thanks for you, making mention of you in my prayers,
(17) That the God of our Lord Jesus Christ, the Father of glory, may give unto you the spirit of wisdom and revelation in the knowledge of him:
(18) The eyes of your understanding being enlightened; that ye may know what is the hope of his calling, and what the riches of the glory of his inheritance in the saints,
(19) And what is the exceeding greatness of his power to us-ward who believe, according to the working of his mighty power,
(20) Which he wrought in Christ, when he raised him from the dead, and set him at his own right hand in the heavenly places,
(21) Far above all principality, and power, and might, and dominion, and every name that is named, not only in this world, but also in that which is to come:
(22) And hath put all things under his feet, and gave him to be the head over all things to the church,
(23) Which is his body, the fullness of him that filleth all in all.
This was especially true for the centurion Cornelious, who is the only person recorded in the Bible as being baptized with the Holy Ghost before being baptized with water.
Acts 10:34,44-48 KJV
(34) Then Peter opened his mouth, and said, Of a truth I perceive that God is no respecter of persons:
...
(44) While Peter yet spake these words, the Holy Ghost fell on all them which heard the word.
(45) And they of the circumcision which believed were astonished, as many as came with Peter, because that on the Gentiles also was poured out the gift of the Holy Ghost.
(46) For they heard them speak with tongues, and magnify God. Then answered Peter,
(47) Can any man forbid water, that these should not be baptized, which have received the Holy Ghost as well as we?
(48) And he commanded them to be baptized in the name of the Lord. Then prayed they him to tarry certain days.
As we surrender our lives to Jesus, and pray that His will be done in our daily activities, we will be guided, instructed, and strengthened by the Holy Spirit.