The 5 Faculties and the 5 Strengths are the same 5 items. (7 Sets index) Really this is one set. The difference is only whether you have attained the virtues.
Some translations have Faculties and Strengths, while others have 5 Roads to Power and 5 Pillars of Strength. It’s a road to power when you’re on it and a pillar of strength when you have attained it.
Or you could say it’s a road to power when you’re cultivating it and a pillar of strength when you’re using it. Since using these virtues and attaining them are inimately linked, there is probably a good reason the Buddha linked them the way he did.
The 5 Pillars of Strength, the 5 Roads to Power, are:
Sometimes #5 is translated “discernment.”
Insight, #5, is the most useful and important. Making this point seems to be the Buddha’s primary purpose in mentioning this set.
The reason insight is the best of these is that it naturally leads to cultivation of the other 4.
- Merit, what and why? (keiththegreen.wordpress.com)
- Vinaya Parajika 3 do not kill – accesstoinsight detailed commentary (buddhafolk.wordpress.com)