The Christian life receives its strongest motive to God’s work through the person and redemptive act of Christ
For we have been adopted as sons by the Lord with this one condition: that our life express Christ, the bond of our adoption. Accordingly, unless we give and devote ourselves to righteousness, we not only revolt from our Creator with wicked perfidy but we also abjure our Savior Himself. …
Ever since God exhibited himself to us as a Father, we must be convicted of extreme ingratitude if we do not in turn exhibit ourselves as his sons.
Ever since Christ purified us by the laver of his blood, and communicated this purification by baptism, it would ill become us to be defiled with new pollution.
Ever since he ingrafted us into his body, we, who are his members, should anxiously beware of contracting any stain or taint.
Ever since he who is our head ascended to heaven, it is befitting in us to withdraw our affections from the earth, and with our whole soul aspire to heaven.
Ever since the Holy Spirit dedicated us as temples to the Lord, we should make it our endeavour to show forth the glory of God, and guard against being profaned by the defilement of sin.
Ever since our soul and body were destined to heavenly incorruptibility and an unfading crown, we should earnestly strive to keep them pure and uncorrupted against the day of the Lord.
These, I say, are the surest foundations of a well-regulated life, and you will search in vain for any thing resembling them among philosophers, who, in their commendation of virtue, never rise higher than the natural dignity of man.
Institutes of the Christian Religion, III.vi.3.
(adapted from McNeill-Battles and Beveridge)