John 14:26 “But the Comforter, which is the Holy Ghost, whom the Father will send in my name, he shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you.”
Jesus had promised His disciples that the Father would send the Holy Ghost after He leaves. He will not leave His disciples on their own. Before He could come, Christ must ascend to Heaven.
The very Name of the Holy Ghost, or Holy Spirit, reveals a large part of His ministry. His presence within the heart of the believer will provide assurance of salvation and give access to God in prayer. He will also provide comfort in the heart of believers, even when facing difficulties – if they will bring their cares and concerns to God in prayer with faith.
The Spirit of God can give calm when others are panicking, as well as clarity of mind in those times. It will be so noticeable to others that they will wonder how you can be calm when…
God desires that Christians maintain a state of prayer throughout the day (“men ought always to pray, and not to faint” Luke 18:1). In prayer, needs can be brought to Him, as well as concerns. When doing His will, He provides peace beyond our understanding (Philippians 4:6,7).
The above verse also mentions another ministry of the Holy Spirit. He will teach you His Word and help you remember it when needed.