"The prayer of a righteous person has great power as it is working.” (James 5:14-16)
"Do not be anxious about anything, but in every situation, by prayer and petition, with thanksgiving, present your requests to God. And the peace of God, which transcends all understanding, will guard your hearts and your minds in Christ Jesus". (Philippians 4:6-7)
"Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours". (Mark 11:24)