Heaven never fails to make the Word of God
good, to fulfill every promise in it and to
inflict every penalty for disobedience. The
Lord Jesus is working with us, confirming
the Word with signs following.

So we can be sure if we speak His word as He
has told us to do, He will not let any of our
words fall to the ground but will confirm them
with signs following, setting the seal of heaven
on them.