Our New Zealand Ministry of Education has this to say:
Leading with moral purpose means having a commitment to making a difference in the lives and outcomes of students as a result of their experiences at school. Barber and Fullan (2005) explain that: “The central moral purpose consists of constantly improving student achievement and ensuring that achievement gaps, wherever they exist, are narrowed.” For a school to achieve this, there needs to be a shared commitment to explicit values.Source http://www.educationalleaders.govt.nz/Culture/Attitudes-values-and-ethics/Moral-purpose-and-shared-leadership
Professor David Hopkins, in an article titled 'Leadership for powerful learning' (ACEL Journal Term 2 2015, Vol 37 No 2) states:
Leaders are driven by a moral purpose about enhancing student learning. Moral purpose activates the passion to reach for the goal and prompts leaders to empower teachers and others to make schools a critical force for improving communities"Now there's a powerful statement.