He was - It is probable that John had been cast into prison before this. Hence, his public ministry had ceased, and our Saviour says he was such a light.
Light - The word in the original properly means a “lamp,” and is not the same which in John 1:4-5 is translated “light.” That is a word commonly applied to the sun, the fountain of light; this means a lamp, or a light that is lit up or kindled artificially from oil or tallow. A teacher is often called a “light,” because he guides or illuminates the minds of others. Romans 2:19; “thou art confident that thou art a guide of the blind, a light of them that sit in darkness;” John 8:12; John 12:46; Matthew 5:14.
A burning - A lamp lit up that burns with a steady luster.
Shining - Not dim, not indistinct. The expression means that he was an eminent teacher; that his doctrines were clear, distinct, consistent.
Ye were willing - You willed, or you chose; you went out voluntarily. This shows that some of those whom Jesus was now addressing were among the great multitudes of Pharisees that came unto John in the wilderness, Matthew 3:7. As they had at one time admitted John to be a prophet, so Jesus might with great propriety adduce his testimony in his favor.
For a season - In the original, for an “hour” - denoting only a short time. They did it, as many others do, while he was popular, and it was the “fashion” to follow him.
To rejoice in his light - To rejoice in his doctrines, and in admitting that he was a distinguished prophet; perhaps, also, to rejoice that he professed to be sent to introduce the Messiah, until they found that he bore testimony to Jesus of Nazareth.