John 7:3-5
For, says he, “His brethren said unto Him, Depart hence, and go into Judæa, that Your disciples also may see the works that You do; for there is no man that does anything in secret, and he himself seeks to be known openly. Show yourself to the world. For neither did His brethren believe in Him.”
2. What unbelief, says some one, is here? They exhort Him to work miracles. It is great deed; for of unbelief come their words, and their insolence, and their unseasonable freedom of speech. For they thought, that owing to their relationship, it was lawful for them to address Him boldly. And their request seems forsooth to be that of friends, but the words were those of great maliciousness. For in this place they reproach Him with cowardice and vainglory: since to say, “no man does anything in secret,” is the expression of persons charging Him with cowardice, and suspecting the things done by Him as being not really done; and to add, that “he seeks to be known,” was to accuse Him of vainglory. But observe, I pray you, the power of Christ. Of those who said these things, one became first Bishop of Jerusalem, the blessed James, of whom Paul says, “Other of the Apostles saw I none, save James, the Lord's brother”; and Judas also is said to have been a marvelous man. And yet these persons had been present also at Cana, when the wine was made, but as yet they profited nothing. Whence then had they so great unbelief? From their evil mind, and from envy; for superiority among kindred is wont somehow to be envied by such as are not alike exalted. But who are those that they call disciples here? The crowd that followed Him, not the twelve. What then says Christ? Observe how mildly He answered; He said not, “Who are you that counsel and instruct Me thus?” but,
Source: Homilies on the Gospel of John (New Advent)