"And a leper came to him, imploring him, and kneeling said to him, 'If you will, you can make me clean'. Moved with pity, he stretched out his hand and touched him and said to him, 'I will; be clean.'" - Mark 1:40-41
How do you ask for something? Do you frequently say, "If you don't mind would you...?" or "Would you be willing to...?" or "If it wouldn't be too much of a bother would you...?" The intent is to show respect and consideration for the one we are approaching. We are careful not to take them for granted.
This leper approached Jesus with the very same respect and consideration. He was fully confident that the Lord was able to make him clean in the words "you can". But he understood that there was a great difference in what Jesus "can" do and "will" do. While he came with certain faith, he was careful not to take the Lord for granted.
In the passage above we have more than a request made to a friend. This leper came to the Lord of the universe with a very personal need. He came with respect and consideration of the "will" and wisdom of God. Take note my friend and the next time you approach the Lord with a request, give Him the respect that He deserves and the consideration that He knows what is best for His child. Be careful not to take Him for granted.