A petition is, by definition, “a formal, written request addressed to a sovereign superior for a particular right or grace.” Supplication is “a humble, earnest petition.” If we put them together, we could say the prayer of petition and supplication is “an earnest, humble, written request addressed to a sovereign superior for a particular right or grace.”
Because of our redemption through Jesus’ sacrifice on the cross, we are in a covenant position with God. He has made us to sit together with Him in heavenly places in Christ Jesus (Ephesians 2:6).
We have the right to take the Name of Jesus before the throne of grace and whatever we ask in prayer, we receive because our faith is in His WORD and our covenant with Him. The effectiveness of our prayer lives depends on the degree of confidence we place in The WORD of God and the Holy Spirit.