The Spirit Filled : This we can found in Acts 2:4. The classic text on the fullness of Christ is from Ephesians 5:18. . Never confused with the term "Baptism with Spirit" and "Filling with Spirit". I heard preachers say "Oh!, It makes no difference what you call it as long as you have the experience". I Don't believe that for a moment. Bible uses accurate terminology, and we do not have the privilege or the right to change the words that God has written, inspired by the Holy Spirit (1 Cor 2:12,13). Baptism talks about identification with Christ (Romans 6) and it required death, burial and resurrection. where are filling talks about the take into.

The baptism of Spirit happens once. When you are saved you are baptized into the Body of Christ. There is no repetition of the baptism of spirit in any individual person. No where in the Bible are we commanded to be baptized by the spirit of God. But 

Praise be to God ! He Baptized me into His Body the moment I Accepted Him as my personal Saviour He Came into my heart as Holy Spirit. Now I am into his body. and I am identified with Him

There is however a repetition of the fullness of the spirit. In the book of Acts you read that the believers repeatedly filled with Holy Spirit. ( Acts 2:4, 4:8, 31).We do not read that  they were repeatedly baptized by the spirit.

Our Co-Operation In Filling the Spirit : The fullness of Spirit required our co-operation. The baptism The baptism of the spirit occurs when you trust Chrsit as your saviour, once and for all. The Baptism of Spirit is a single experience. The fullness of the christ is a personal, individual experience, giving the beleiver power for witness and for Christian living.Why were the apostles and other beleivers filled with the holy spirit? Primarly that they might witness by word and by Deed. Acts 1:8 makes that very clear. The task of the church is witnessing.We are all commanded to be witnesses, and we should see to win many as we can. Witnessing is the work of the Holy Spirit through the beleivers. If we are filled with the Holy Spirit of God, we can bear witness of our Lord Jesus Christ.

How Shall We know that We are filled with Holy Spirit : Ephesians 5:19 tells us 

we will be joyfull. Speaking to yourself in psalms, and hymns and spiritual songs, singing and making melody in your heart to the Lord.

We will be thankfull. "Giving thanks always for all the things unto God in the Father in the name of Our Lord Jesus Christ. And

we will be submissive: "Submitting yourself one another in the fear of the God."

When you are filled with Holy Spirit you will find it easy to remember the scripture. because the Holy Spirit reminds you. When you are filled with Holy Spirit, you have desire to witness and the witness comes from God. It is not some thing you manufacture.

By this we can conclude that We can find out that spirit filled life is not measured on what a person does but by the way he lives(joyfullness, thankfull and submissive) and his life itself is a witness.

The Spirit filled these beleivers, and because they were filled they went forth giving bold witness for the Lord. "But ye shall receive power, after the Holy Ghost is come upon you. and  ye shall be witness unto me" Promise the Lord made in Acts 1:8. We need this today.

Requirement for Filling : To be filled with Holy Spirit requires cleansing. We must confess our sins and be cleansed by the blood of Jesus Christ. We must want to be filled for the glory of God. Not to enjoy a selfish experience