Charade No. 19 (with answer in verse)

I had mentioned in an earlier post that it was sometimes the practice to provide an answer to a charade in verse. This was done, for example, in some magazines, where readers submitted their answers in rhyming form, and the magazine published one or more.

Here is one of them. The first comment gives the original rhymed answer.

My first you will be,
    If you're good and upright;
My second you'll see
    In a sharp frosty night.

Together combin'd
    I'm a virtue that's great,
That should govern each mind,
    And preside in each state.