Adam Clarke on John 7:4

No man that doeth any thing in secret, etc. - They took it for granted that Christ was influenced by the same spirit which themselves felt; and that therefore he should use every opportunity of exhibiting himself to the public, that he might get into repute; and they hoped that a part of his honor would be reflected back upon themselves, as being his near relations. They seem to have said: "It is too little to employ thyself in working miracles in Galilee, in the country, and in small villages, among an ignorant and credulous people, from whom thou canst not get much credit: go to Jerusalem, the capital, and among the learned doctors, in the presence of the whole nation assembled at this feast, work thy miracles, and get thyself a name."