The following is an excerpt from Thoughts to Make Your Heart Sing by Sally Lloyd-Jones (page 100-101):
Do you think that maybe your prayers aren’t long enough?
Or don’t use enough special words?
In the Bible there are lots of little prayers—so little they couldn’t be any littler.
“Help, Lord!”, “Lord, save me!”
They’re arrow prayers, quickly shot up to God.
Once, in the middle of the night, during a huge storm, Jesus came to see his friends on the lake—walking on top of the water.
Peter wanted to try, so Jesus said, “Come on!”
Peter stepped out of the boat and walked on water.
But then he looked down—and, starting to sink, cried, “Lord, save me!”
Immediately, Jesus caught him.
Your prayer might be so little that it may not seem like a prayer at all.
But it’s enough. God hears it.
“‘Save me, Lord!’ he shouted.”
Matthew 14:30–31 (NLT )