I found this quote online it’s beautifully said:
“Prayer really does things. It cannot change God’s intention, but it does change God’s action. God had long intended Isaiah to be his prophet. When Isaiah said, ‘Here am I, send me,’ he did not alter in the least the divine purpose, but he did release it. God could do then what before he could not.”
— Harry Emerson Fosdick, founding minister of Riverside Church
Why Do I Pray .com 