New Defender's Study Bible Notes
4:8 virtue. The English word is related to “virility,” which is closer to the meaning of the Greek word here (arete). The latter is different from that in Mark 5:30 (dunamis), which is best understood as “power.”
4:8 these things. Think of these things—therefore, not on other things! This is an important guideline for educators. If God does not want us to think on evil or ugly things, then surely our school curricula should keep away from them, except to provide antidotes for them. This principle should also guide our individual study and activities.