Richard Foster writes: “.. we all come to prayer with a tangled mass of motives … but … God is big enough to receive us with all our mixture. … God receives us just as we are and accepts our prayers just as they are. In the same way that a small child cannot draw a bad picture so a child of God cannot offer a bad prayer.” ("Prayer", Hodder & Stoughton, 1992, p.8/9).
I really like that image which says so much about how God engages with us. Prayer is an expression of relationship. In prayer we have the opportunity of communication with God - and how we need that, both so that we can express our concerns to God and so that we can listen to what God is saying to us.