377. 'The ground' here means schism or heresy. This is clear from the fact that 'a field' means doctrine, and therefore 'the ground' of which the field is a part is schism. Man himself is meant by 'the ground' as well as by 'the field' because these things are sown within him. Indeed it is by virtue of what is sown within that anyone is man. Anyone who is good and true is so by virtue of goods and truths; anyone evil and false is so by virtue of evils and falsities. Anyone who subscribes to a particular system of doctrine is referred to by the name of that system, as is anyone who subscribes to a particular schism or heresy; and so 'ground' at this point stands for schism or heresy within man.