I have condemned the notion of volunteering. I didn't know then I had support. Perhaps because I was too blinded by the ignorance of today's protestants, mainly the chinese of the west, to such crucial discipline.
We serve as we are called by God, in our heart, as our Lord's servants. Not to volunteer, thus it is not to be praised to such an extend as I have seen the ignorant zealots are doing.
Martin Luther condemned it, which was supported by Catholic and even the Muslims.
Then the Anglicans, in their 39 articles (article 14), followed by the Wesleyans/methodists (Articles of Religion/Book of disciplines: article 11).
Article XIV from the thirty-nine articles
Of Works of Supererogation 分外功行
Voluntary works besides, over and above, God's commandments which they call Works of Supererogation, cannot be taught without arrogancy and impiety. For by them men do declare that they do not only render unto God as much as they are bound to do, but that they do more for His sake than of bounden duty is required: Whereas Christ saith plainly, When ye have done all that are commanded to you, say, We be unprofitable servants.
Elaborated in
Institutes of the Christian Religion: Book III, Chapter 14:
The Beginning of Justification and Its Continual Progress.