1 Thessalonians 5:16-18 (NIV)
Rejoice always, pray continually, give thanks in all circumstances; for this is God’s will for you in Christ Jesus.

An attitude of gratitude and praise to God Almighty will promote the fullness of the Holy Spirit into our life. The nature of God’s Spirit is pure and holy. Thanking and praising God in every circumstances ( joy and suffering) will cleanse us of any negativity in our life. Negative energies or substances within us will quince the presence of the Holy Spirit of God Almighty. When we have developed this habit of thankfulness to God in our heart, the fruits of the Holy Spirit ( Galatians 5:22-23) will start to manifest and create a joyful heart within us. A grateful heart is irresistible to God and will open the windows of heaven into our life.

1. A good concept that we can use to illustrate this is how babies or children have the power to make their parents do what they want their parents to do. The pure and innocent hearts of babies and kids will break the parents hearts if they can not meet their children’s needs. It is in the similar manner that Praise, Worship and Thanksgiving will break the heart of God for Him to answer our prayers.  An attitude of gratitude is a pure and innocent way of relating to God Almighty.
2. More verses on this topic (link)