Knock, and it shall be opened unto you,
    If you, indeed, are true.
If so, the Bridegroom's door will open wide
    To let His guest inside.

Knock, but beware if true, indeed, you're not;
    For not one tittle or jot
Shall pass the Lion guarding, at attention,
    The door to God's dimension.  
He'll bounce you off the doorstep with a roar
    Like none you've heard before.