The believer of the gospel has no alternative but to step aside from the world. He cannot otherwise carry out the will of Christ concerning those whom he asks for his own. What this stepping aside from the world means, there need be no difficulty in the earnest man determining for himself. Christ and the apostles have in themselves furnished an example which we are invited to imitate (1 Peter 2: 21; John 13: 15; 15: 18-20; 1 Corinthians 11: 1; 4: 17).
It does not mean seclusion: for they lived an open daily public life. It does not mean isolation: for they are always seen among men. It means abstinence from the aims and principles of the world, and from the movements and enterprises in which these find expression . . ..
The sense in which they stand apart from the world is in the objects for which they work, and in the use to which they put the time and means which they call their own... They are to be "holy in all manner of conversation," cleansing themselves from all filthiness of the flesh and spirit, and walking as those who are the temple of God among men (1 Peter 1: 15; 2 Corinthians 7: 1; 2 Corinthians 6: 16).
Guided by these apostolic principles, they will abstain from the defiling habits that are common to ungodly Christendom, amongst which smoking and drinking stand prominent. And as men waiting and preparing for the kingdom of God (whose citizenship is in heaven, and not upon the earth) they accept the position of "strangers and pilgrims" among men. They are not at home; they are passing on. They take no part with Caesar. They pay his taxes and obey his laws where they do not conflict with the laws of Christ; but they take no part in his affairs.
They do not vote; they do not ask the suffrages of his supporters; they do not aspire to Caesars honours or emoluments; they do not bear arms. They are sojourners in Caesar's realms during the short time God may appoint for their probation; and as such, they sustain a passive and non-resisting attitude, bent only upon earning Christ's approbation at his coming, by their obedience to his commandments during his absence...
(Extract from Christendom Astray Lecture 17 The Commandments of Christ, Pages 246-247 by Bro. R. Roberts).