Which is more important in the musical development of a student- the teacher or the environment?

This post has not come easily for I’m not sure that I will be able to articulate my thoughts effectively. The ultimate goal will be to cause thought, evaluation and deep reflection on a very debatable issue which is “Does a student’s improvement depend on the ability of the teacher, or is success more dependent on competition from the student’s environment”? One of the greatest benefits of advanced age coupled with retirement is the fact that one has time to sit back and reflect on issues which are seemingly important to the retiree, even if not as important to his/her…