Be anxious for nothing, but in everything by prayer and supplication, with thanksgiving, let your requests be made known to God; and the peace of God, which surpasses all understanding, will guard your hearts and minds through Christ Jesus.
Prayer is the opening of the heart to God as to a friend. Not that it is necessary in order to make known to God what we are, but in order to enable us to receive Him. Prayer does not bring God down to us, but brings us up to Him. Steps to Christ, p 93
John 17:20, 21
My prayer is not for them alone. I pray also for those who will believe in me through their message that all of you may be one, Father, just as you are in me and I in you.
2 Chronicles 7:14, 15
If my people, who are called by my name, will humble themselves and pray and seek my face and turn from their wicked ways then will I hear in heaven and forgive their sin and will heal their land. Now my eyes will be open and my ears attentive to the prayers...
And I say unto you, ask, and it will be given to you; seek, and you will find; knock and it will be opened to you. For everyone who asks receives and he who seeks finds, and to him who knocks it will be opened... If you then, being evil know how to give good gifts to your children, how much more will your heavenly Father give the Holy Spirit to those who ask Him!