Though we belong to the perishing order of nature by our bodily frame,
we belong to the undecaying realm of grace by the spirit that lays hold
upon God. And if our work weary us, as it must do so long as we
continue here, yet in the deepest sanctuary of our being, our strength
is greatened by exercise. 'Thy shoes shall be iron and brass.' 'Thy
raiment waxed not old upon thee, neither did thy foot swell, these
forty years.' 'Stand, therefore, having your feet shod with the
preparedness of the Gospel of peace.'

But this is not all. There is an advance even upon these great promises
in the closing words. That second clause of our text says more than the
first one. 'Thy shoes shall be iron and brass,' that promises us powers
and provision adapted to, and unexhausted by, the weary pilgrimage and
rough road of life. But 'as thy days, so shall thy strength be,' says
even more than that. The meaning of the word rendered 'strength' in our
version is very doubtful, and most modern translators are inclined to
render it 'rest.' But if we adhere to the translation of our version,
we get a forcible and relevant promise, which fits on well to the
previous clause, understood as it has been in my previous remarks. The
usual understanding of the words is 'strength proportioned to thy day,'
an idea which we have found already suggested by the previous clause.
But that explanation rests on, or at any rate derives support from, the
common misquotation of the words. They are not, as we generally hear
them quoted, 'As thy day, so shall thy strength be,'--but 'day' is in
the plural, and that makes a great difference. 'As thy days, so shall
thy strength be,' that is to say: the two sums--of 'thy days' and of
'thy strength'--keep growing side by side, the one as fast as the other
and no faster. The days increase. Well, what then? The strength
increases too. As I said, we are allied to two worlds. According to the
law of one of them, the outer world of physical life, we soon reach the