John 11:10

But if a man walk in the night, he stumbleth, because there is no light in him.

Jesus, after the deliberate delay, announced in a most casual way that He intended to return to Judea, by inviting His disciples to make the journey with Him. But the disciples were filled with apprehension at the prospect. It was probably just as much fear for their own safety as for that; of the Lord which caused them to remind Him of the recent attempts of the Jews to stone Him, chap. 8:59; 10:31. They believed that He should consider His safety first and not expose Himself to danger. Jesus answers their objections in a parable. A person that walks about in the day will not stumble and fall, for there is sufficient light to guide his footsteps and to show him obstructions. But if a person walks around in the darkness, harm may easily befall him, since there is no light to point out hindrances and pitfalls. The eye can be of service only during the day and in the light. The explanation which the Lord wished to convey to His disciples is evident. While His day, as appointed to Him by the Father, lasted, He must continue to walk and to work, and no one could hinder and hurt Him. The last hour, the end of His life, the time of dark suffering, anguish, and sorrow, had not yet come. The Jews would not be able to vent their spite until the time specified and fixed by His Father in the eternal council of love had come. This is true of all disciples of Jesus. So long as the day of their life and work lasts, so long they may carry on their labors without real hindrance. The Lord has fixed the length of each one's labor, to the one a greater, to the other a smaller measure. During that time the believers, each in his own station, but in the service of the Lord, will do his share for the Master. At the Lord's time, and not before, He will call His servants home.