"This sickness is not to end in death, but for the glory of God, so that the Son of God may be glorified by it." (John 11:4) "I am the resurrection and the life; he who believes in Me will live even if he dies, and everyone who lives and believes in Me will never die. Do you believe this?" (John 11:25-26)
These are Jesus Christ's very words when his very good friend Lazarus was very sick, and ultimately died. He knew a greater reason why such a situation was happening. He wept. But he had greater confidence in His Heavenly Father's plan - this is not to end in death, but for the glory of God. Jesus Christ knew that Lazarus will be brought back to life, for in that particular event, God is going to reveal something of great importance, not just back then, but even for you and me today.