A disciple, by definition, is a learner. Any learning that is worthwhile genuinely benefits oneself and others.

As we are blessed in the Lord, we can learn to be fruitful (John 15:5) —
to God’s everlasting glory (John 15:8).
As we learn to be fruitful, we are further blessed in the Lord (John 13:17) —
to our everlasting joy (John 15:11).

“His divine power has granted to us all things that pertain to life and godliness…. For this very reason, make every effort to supplement your faith with virtue, and virtue with knowledge…. For if these qualities are yours and are increasing, they keep you from being ineffective or unfruitful…” (2 Peter 1:3-8 ESV).