Create in me a pure heart

Acts 8:14-40
Peter and John placed their hands on them, and they received the Holy Spirit.
Simon was rebuked by peter for his heart is not right before God.
Philip proclaimed gospel to the people in Samaritan, Peter and John was sent to Samaritan,because Holy Spirit had not yet come upon any of them.
Philip listen to the message from Angel "Go south to the road - the desert road- that goes down from Jerusalem to Gaza." So he started out and on his way he met an Ethiopian eunuch, an important official in charge of all the treasury of Candace, queen of the Ethiopians.
Candace: The title of the queen mother who ruled the country on behalf of her son. The king himself, defiled as the child of the sun-god, was considered too holy for such secular.
Both Philip and the eunuch went down into the water and Philip baptized him. When they came up out of the water, the spirit of the Lord suddenly took Philip away, and the eunuch did not see him again, but went on his way rejoicing.
It is Philip's power which draws Simon, and he covets the power to convey the gift of the Spirit, needing Peter's stern words to set him right.
Why?
Every believer has the Spirit of God- see Romans 8:9 1 Corinthians 12:13. But there is special significance in the visible sign of the coming of the Spirit- given when the apostles officially recognize these members of the despised enemy nation as equal citizens in God's kingdom.
At the height of Philip's flourishing Samaritan campaign God calls him away to meet the need of an individual. Eunuchs were barred from the Temple, but God knows this foreigner is ready to receive the Good news about Jesus.
Motivation; heart is right or not before God is more important than what he is or what he has done.
How?
Create in me a pure heart, O God, and renew a steadfast spirit within me. (Psalm 51:10)