World Wide Study Bible
a Bible passage
9. Jesus answered, Are there not twelve hours in the day?—(See on Joh 9:4). Our Lord's day had now reached its eleventh hour, and having till now "walked in the day," He would not mistime the remaining and more critical part of His work, which would be as fatal, He says, as omitting it altogether; for "if a man (so He speaks, putting Himself under the same great law of duty as all other men—if a man) walk in the night, he stumbleth, because there is no light in him."