Charles H. Spurgeon on Psalms 85:8

It is hard to know, in spiritual exercises, whether is be more difficult to attain some good frame, or to keep and maintain it when it is attained; whether more seriousness is required for making peace with God, or for keeping of it when made; whether more diligence should be in preparing for a communion, or more watchfulness after it: sure both are required; and it was our blessed Lord's word, Mt 26:41, after the first celebration of his supper, "Watch and pray, that ye enter not into temptation." Here that saying holds eminently: "Non minor est virtus, quam quaerere, parta tueri:" no less virtue and valour is requisite to maintain, than to make a purchase or conquest. In the words there are,

1. A great mercy promised from the Lord to his people, viz., He will speak peace to them.

2. A special caveat and advertisement given them, pointing at their hazard: But let them not turn again to folly: that is, let not his people and saints to whom he hath spoken peace, return to sin; let them beware of bourding (Bourding —jesting), and dallying with God's mercy, and of turning his grace into wantonness, of cooling in their affections to him, of slipping back to their old way, and of embracing their old lovers and idols: for that is folly, even in folio, to speak so. James Durham, in "The Unsearchable Riches of Christ."