Charles H. Spurgeon on Psalms 41:12

Integrity. This same integrity is like Noah's ark, wherein he was preserved, when others perished, being without it. It is like the red thread, which the spies of Joshua gave to Rahab, it was a charter whereby she claimed her life when the rest were destroyed, which had not the like. So is this integrity of small reckoning, I confess, with the men of this world, which think that there is no other heaven but earth; but as Rahab's thread was better to her than all her goods and substance when the sword came, so this is better to God's children than all the world when death comes. If they have this within they care not, nay, they need not care what can come without. If Satan's buffeting come, this is a helmet of proof; if Satan's darts fly out, this is a shield to quench them; if floods of crosses come to carry us away, this is a boat to bear us up; if all the world cast mire and filth in our faces, we are never a whit the more deformed, but still beautiful for all that, for "the king's daughter, "(saith Solomon, Ps 45:13), that is, the church of Christ, "is all glorious within." William Burton.