His relationship with Mary, Martha, and Lazarus was different from the relationship He had with other people. Why? One reason is, as we find in other places, He stayed with this family when He was near Jerusalem. He had undoubtedly eaten quite a number of meals at their home, and they had had ample time to talk about the plan of God, as well as their hopes and dreams, problems, trials, and difficulties. Jesus likely counseled them in these matters. As a result of this fellowship, within this family atmosphere, grew an intimacy of thinking that He did not have with many others. The Bible does not say all that often that He loved somebody the way He loved these.
Trust in a historical fact can be essentially passive, but so what? It might not be a vital part of life. However, a Christian cannot have the kind of conviction needed unless he recognizes that he is fellowshipping with a very wonderful, living, dynamic, and gracious Personality. When we pray to Him, He wants us to think about that relationship, about Him, His power, His willingness, His purpose, and everything connected with Him in His relationship with us.
Trust in a Personality energizes the quality of the prayer. In this case, it infuses the trust with a firsthand knowledge of the Being to whom we are appealing. Prayer's most important fruit may well be the understanding gained of this Personality: what He is and what He does.