 One is that it characteristically comes only with experience of life. Amongst the morally relevant features of a situation may be the likely consequences, for the people involved, of a certain action, and this is something that adolescents are notoriously clueless about precisely because they are inexperienced. It is part of practical wisdom to be wise about human beings and human life. (It should go without saying that the virtuous are mindful of the consequences of possible actions. How could they fail to be reckless, thoughtless and short-sighted if they were not?)