Living witnesses to the Gospel

What kind of life commends the Gospel?

My stock answer would be something like Paul in 2 Corinthians 6:6: "by purity, knowledge, patience, kindness, the Holy Spirit, genuine love". In short, by 'the good life'.

But that isn't the whole picture. As Paul himself says in that passage it is also by "great endurance, in afflictions, hardships, calamities, beatings, imprisonments, riots, labours, sleepless nights, hunger" (vv. 4-5). We commend the Gospel by suffering! I don't often hear that or say that, and I think that is because I'm a closet theologian of glory.

Sinning less is how I see us commending the Gospel. But that isn't a rounded New Testament picture. In many ways it is by appearing foolish, weak and bad in the world's eyes that the Gospel is most proclaimed. Not by seeming to be wise, strong and holy.

Although this does not flow seamlessly, PT Forsyth has his own problem with the idea that it is by sinning less that we commend the Gospel:

The difference between the Christian and the world is not that the world sins and the Christian does not. It suits the world to think that it is; because it offers a handy whip to scourge the Church’s consistency while resenting its demands. But such a distinction is no part of the Church's claim. Nor does it mark off the Christian’s worldly years from his life in Christ. A difference of that kind is merely in quantity — all the sin on the one side, none of it on the other. But the real difference (I must say often) is not in quantity; it is in quality. It is not in the number of sins, but in the attitude toward sin and the things called sin. It is in the man's sympathies, his affinities; it is in his conscience, his verdict on sin, his treatment of it — whether the world's or his own.

(p.109, God the Holy Father)

So both in respect of our physical lives, and our moral lives, it is also being put to death (in the physical body by others, and the moral 'body' by ourselves) that we point people to Christ.

As Paul said "We are...always carrying in the body the death of Jesus, so that the life of Jesus may also be manifested in our bodies" (4:8-10).