The prayer of Hannah in 1 Samuel chapter one is one of the most heartfelt prayers recorded in Scripture. She gives a powerful strategy for answered prayer; she had an issue, she PETITIONED the Lord, she was SPECIFIC with her request, she received and believed the PROMISE and the Lord REMEMBERED her.
1 Samuel 1:13-19 New King James Version (NKJV)
"13 Now Hannah spoke in her heart; only her lips moved, but her voice was not heard. Therefore, Eli thought she was drunk. 14 So Eli said to her, “How long will you be drunk? Put your wine away from you!”
15 But Hannah answered and said, “No, my lord, I am a woman of sorrowful spirit. I have drunk neither wine nor intoxicating drink, but have poured out my soul before the LORD. 16 Do not consider your maidservant a wicked[a] woman, for out of the abundance of my complaint and grief I have spoken until now.”
17 Then Eli answered and said, “Go in peace, and the God of Israel grant your petition which you have asked of Him.”
18 And she said, “Let your maidservant find favor in your sight.” So the woman went her way and ate, and her face was no longer sad.
19 Then they rose early in the morning and worshiped before the LORD, and returned and came to their house at Ramah. And Elkanah knew Hannah his wife, and the LORD remembered her."