I came across this quote via Sojourners:
Christ, in sending the [people] to the scriptures, sent them, not merely to read them, but carefully to search and ponder them. And did he not say, “Read the scriptures,” but “Search the scriptures.” … Their meaning is not expressed superficially or set forth in their literal sense, but, like a treasure, lies buried at a great depth. And those who seek for hidden things will not be able to find the object of the search if they do not seek carefully and painstakingly.
– St. John Chrysostom
Homily 41 (John 5:39-47), A.D. 390