Johann Arndt

This truth is a remedy against spiritual pride, namely, that none should account himself better before God than others, though perhaps adorned with greater gifts, and endowments.

But since the world, which thou art to strive against, is not without thee, but within thee, it follows, that it is also to be conquered not without, but within thee.

In short, all things that please the natural man in this world, are, to a true Christian, only so many crosses and temptations, allurements of sin and snares of death, that continually exercise his virtue.

Whatever man uses without the fear of God, whatever he applies to the mere gratifying of his flesh, cannot fail to operate as a poison to the soul, however pleasant and salutary it may appear to be to the body.