Adam Clarke on Daniel 1:17

As for these four children - Young men or youths. Our translation gives a false idea.

In all visions and dreams - That is, such as are Divine; for as to dreams in general, they have as much signification as they have connection, being the effects of the state of the body, of the mind, or of the circumstances of the dreamer. A dream may be considered supernatural, if it have nothing preposterous, nothing monstrous, and nothing irregular. If the whole order and consequences of the things be preserved in them, from beginning to end, then we may presume they are supernatural. In such dreams Daniel had understanding.