"The Lord will perfect that which concerneth me."-Psalm 138:8

Most manifestly the confidence which the Psalmist here expressed was a
divine confidence. He did not say, "I have grace enough to perfect that
which concerneth me-my faith is so steady that it will not stagger-my
love is so warm that it will never grow cold-my resolution is so firm
that nothing can move it; no, his dependence was on the Lord alone. If we
indulge in any confidence which is not grounded on the Rock of ages,
our confidence is worse than a dream, it will fall upon us, and cover us
with its ruins, to our sorrow and confusion. All that Nature spins time
will unravel, to the eternal confusion of all who are clothed therein.
The Psalmist was wise, he rested upon nothing short of the Lord's work.
It is the Lord who has begun the good work within us; it is He who has
carried it on; and if he does not finish it, it never will be complete.
If there be one stitch in the celestial garment of our righteousness
which we are to insert ourselves, then we are lost; but this is!
our confidence, the Lord who began will perfect. He has done it all,
must do it all, and will do it all. Our confidence must not be in what
we have done, nor in what we have resolved to do, but entirely in what
the Lord will do. Unbelief insinuates- "You will never be able to
stand. Look at the evil of your heart, you can never conquer sin; remember
the sinful pleasures and temptations of the world that beset you, you
will be certainly allured by them and led astray." Ah! yes, we should
indeed perish if left to our own strength. If we had alone to navigate our
frail vessels over so rough a sea, we might well give up the voyage in
despair; but, thanks be to God, He will perfect that which concerneth
us, and bring us to the desired haven. We can never be too confident
when we confide in Him alone, and never too much concerned to have such a
trust.