7 And when you pray, do not keep on babbling like pagans, for they think they will be heard because of their many words. 8 Do not be like them, for your Father knows what you need before you ask him.
I don't know about anyone else, but I sometimes worry that my prayers aren't long enough. I mean, I know what the above verse means, and I know that God doesn't worry about how many words I use, but on occasion after I have finished praying, I think "is that all I've got to say?".
Of course, God knows what is on my heart, and He knows the things I can't even begin to put into words.
I simply say what's on my mind - pray for those who I've promised to pray for, give thanks to God for what He's done for me and what He continues to do, and leave the rest up to God.
Let us all remember the words of Jesus - "Your Father knows what you need before you ask him".