... Communist labour in the narrower and stricter sense of the word is unpaid labour for the benefit of society, labour performed not as a compulsory duty, not in order to have the right to a certain amount of products, not according to previously established and accepted quotas, but labour that is voluntary, labour without quotas, labour performed without expecting remuneration, without any condition about remuneration, labour performed out of a habit of working for the common good, out of a conscious attitude (that has become a habit) to the need to work for the common good, labour as the requirement of the healthy organism....