Praying through journaling can be a liberating and beautiful means of expression. Your writing can take on the feeling of a love letter or a song and can be accompanied by a heart-wrenching release of emotions.
Do not attempt to censor yourself as you write. Don’t worry about spelling or proper grammar. Do not be afraid of writing down how you truly feel—God knows your heart already. Instead, offer yourself—in all your beauty and your brokenness—freely to God and ask him to use your journal to bring you closer to him. Do not be afraid to give it all to God, who can turn our ashes to beauty, heal our deepest wounds, and set us free.
–from the book Born to Soar: Unleashing God's Word in Your Life