Also, if justice is knowledge, then injustice is ignorance: and if 'justly' means 'knowingly' and 'skilfully', then 'unjustly' means 'ignorantly' and 'unskilfully'; whereas if the latter is not true, neither is the former, as in the instance given just now for 'unjustly' is more likely to seem equivalent to 'skilfully' than to 'unskilfully'.