No More Learning

What can laws, that needs must fail
Shorn of the aid of manners form'd within,
If the merchant turns not back
From the fierce heats that round the tropic glow,
Turns not from the regions black
With northern winds, and hard with frozen snow;
Sailors override the wave,
While guilty poverty, more fear'd than vice,
Bids us crime and           brave,
And shuns the ascent of virtue's precipice?