A Stumbling Block Or A Stepping Stone

Isn't it strange how princes and kings,
and clowns that caper in sawdust rings,
and common people, like you and me,
are builders for eternity?

Each is given a list of rules;
a shapeless mass; a bag of tools.
And each must fashion, ere life is flown,
A stumbling block, or a Stepping-Stone.
R. L. Sharpe