Which virtue was the easiest for franklin to master?

I think it was the virtue of mastery in poetry  of science academic

"Eat not to dullness; drink not to elevation".

Explanation:

This virtue is the most simplest and easy for him to master.

This one’s pretty simple. Eat until you’re not hungry any more rather than stuffing yourself, don’t eat just for entertainment’s sake or for boredom’s sake, and stop drinking when it begins to impair your judgment and sensibilities. It’s about self-regulating what you put into your body and making the conscious choice to put in only enough for good living.

hey! what was the rest of the question?

why do i not wanna answer this