Joy of my life (Tim Pratt)

Joy of my life while left me here!
and still my Love!
steer me from above.
A life well led this truth commends,
with quick or dead it never ends.
Stars are of mighty use;
the night is dark and long;
The road foul; and where one goes right,
six may go wrong.
Ah and guide a crowd.
God's saints are shining lights:
who stays here long must pass o'er dark hills swift streams,
and steep ways as smooth as glass;
but these all night, like candles shed their beams,
and light us into bed.
They are indeed our pillar fires, seen as we go;
they are that City's shining spires we travel to;
a swordlike gleam kept man for sin first out;
this beam will guide him in.