"Great virtue" refers to possessing and exhibiting exceptional moral qualities or principles that are highly valued and admired. It pertains to displaying traits such as integrity, kindness, honesty, compassion, and fairness. Full definition
Since when they do so, they get to learn them better, instill great virtues in them, and bring them up with an exemplary character. (ultimatestrollerguide.com)
It still has one great virtue in its favour, though: individuality. (carbuyer.co.uk)
JC: Perhaps the single greatest virtue of NCLB's approach to assessment and accountability is that it shines a bright light on student performance, as measured against explicit standards of proficiency. (educationnext.org)