Jesus already knew that Lazarus needed healing when the news reached Him. He assures His disciples that the sickness would not have death as its final result, however, God was permitting it for two reasons: the furtherance and accomplishment of the Father's purpose and His glorification, as well as the glorification of Jesus Himself.

His delay in going to Bethany must have puzzled His friends, especially when He allowed it to end in death. Yet, the distressed sisters were to learn that God's delays are not denials. Unrelieved suffering is sometimes necessary to perfect character—Jesus Himself “learned obedience by the things that He suffered” (Hebrews 5:8).

Mary and Martha were sure Jesus would come because He loved them. They had to learn that He was not neglecting them, but that His purpose in delaying was one of godly love. It was probably emotionally painful for Jesus to cause Mary and Martha grief, but He wanted to reveal to them—and to us—that despite our inclination to help our friends, even if we have power to do so, we must be guided by God's Spirit to prioritize His glory and our spiritual welfare, rather than gratify our feelings.