The greatest concern in the world. A short and plain essay, to answer that…

This must be done; You must make it your Exercise to keep a Conscience clear of Offence towards God, and towards Man. You must labour to be acquainted with your whole Duty; And your Acquaintance with the Will of God, must be followed with proportionable Desires and Labours after Obedience to it. You must Pray always, with all Prayer; with Secret ⟨p. 21⟩Prayer, with Household Prayer, with Public Prayer: You must have an high Value for those Two Sacraments of the New-Testament; the Baptism and the Supper of the Lord. You must Religiously Observe the Lords Day. You must preserve your own Place, & Life, and Bed, and Wealth, and Name; You must with the same sincerity befriend your Neighbours also in Theirs: Love your Neighbours as your selves. And, Do as you would be done unto. You must be especially and mightily Conscientious of Relative Christianity: Carry it well in all the Relations, wherein the Lord has placed you, whether Superiors, or Inferiors, or Equals: with such a Carriage, as may adorn the Doctrine of God your Saviour; Such a Carriage, as may render your Correlates the better for you. Briefly, You must Deny all Ungodliness and Worldly Lusts, and live Godlily, and Soberly and Righteously in the World. This is that Holiness without which no man shall see the Lord.

This must be done; You must make it your Exercise to keep a Conscience clear of Offence towards God, and towards Man. You must labour to be acquainted with your whole Duty; And your Acquaintance with the Will of God, must be follow'd with proportionable Desires and Labours after Obedience to it. You must Pray always, with all Prayer; with Secret ⟨p. 21⟩Prayer, with Houshold Prayer, with Publick Prayer: You must have an high Value for those Two Sacraments of the New-Testament; the Baptism and the Supper of the Lord. You must Religiously Observe the Lords Day. You must preserve your own Place, & Life, and Bed, and Wealth, and Name; You must with the same sincerity befriend your Neighbours also in Theirs: Love your Neighbours as your selves. And, Do as you would be done unto. You must be especially and mightily Conscientious of Relative Christianity: Carry it well in all the Relations, wherein the Lord has placed you, whether Superiors, or Inferiors, or Equals: with such a Carriage, as may adorn the Doctrine of God your Saviour; Such a Carriage, as may render your Correlates the better for you. Briefly, You must Deny all Ungodliness and Worldly Lusts, and live Godlily, and Soberly and Righteously in the World. This is that Holiness without which no man shall see the Lord.