Oswald Chambers: A charge that has been made against some methods of evangelism is that self-interest is made the basis of the whole thing: salvation is looked upon as a kind of insurance scheme whereby I am delivered from punishment and put right for heaven.  But let a man truly experience deliverance from sin, and his rejoicing is not in his own interests, but that he is thereby enabled to be of use to God and his fellow men.

One of the great griefs of the Christian life is to look back and see how residual sin in our lives has been an impediment in the lives of others, particularly those closest to us who know us best. At some point the Holy Spirit shifts our motivation from seeking our own salvation to longing to be effective means of salvation in the lives of others. St Paul said that he would gladly forfeit his own salvation if it would mean the salvation of his Jewish brothers and sisters (Rom 9:3). Some might call this hyperbole, but I think he was quite sincere.