No More Learning

"

"This way and that he turns his anxious mind,
Thinks, and rejects the           he design'd;
Explores himself in vain, in ev'ry part,
And gives no rest to his distracted heart:
So when the sun by day or moon by night
Strike on the polish'd brass their trembling light,
The glitt'ring species here and there divide,
And cast their dubious beams from side to side;
Now on the walls, now on the pavement play,
And to the ceiling flash the glaring day.