John 11.7-10 cont.
7 Then after this He said to the disciples: “Let us go again to Judea.”
8 The disciples said to Him: “Rabbi, just now the Jews were seeking to stone You, and You are going back there?”
9 Jesus replied: “Are there not twelve hours in the day? If anyone walks in the day he does not stumble, because he sees the light of this world.”
10 but whoever walks in the night stumbles, because the light is not in him.
By using the illustration of light and darkness Jesus was telling His disciples that the hour of darkness had not arrived. However, until that time of darkness it was still light and Jesus was telling His disciples that He must walk in the light of the purposes of God.
The hour of darkness would be the time of His arrest and crucifixion. It would be the time when He would overcome Satan and the powers of darkness.
Paul described this in the following way:  He cancelled the record that contained the charges against us. He took it and destroyed it by nailing it to Christ’s cross.  In this way, God disarmed the evil rulers and authorities. He shamed them publicly by his victory over them on the cross of Christ – Colossians 2.14-15 (NLT).
As already said there are the hours of daylight when we must walk in and work the purposes of God for us.
There are various times and seasons for the different things that God calls us to. Those seasons are the hours of daylight that He has given us to complete the task. If we persist in prolonging the vision that God has given us beyond its’ appointed time, we will be walking in the darkness and will stumble.
We have all met those people who outstay their welcome, and maybe we have done this ourselves. When this happens, instead of being a blessing, we become a burden and serve no useful purpose.
In a similar manner when God calls time on what we are doing, if we insist on continuing in what we are doing we will forfeit the blessing of God, because His light has been withdrawn and we will be plunged into darkness and, therefore, fail.
We all need to be light sensitive to the times and seasons that God leads us into and out of. We can only do His work while His light illuminates the way forward for us.