Love May Abound

And this I pray, that your love may abound still more and more in real knowledge and all discernment, - Phil 1:9 NASB

your love

Agápe (ἀγάπη agápē[1]) means love in a "spiritual" sense. In the term s'agapo (Σ'αγαπώ), which means "I love you" in Ancient Greek, it often refers to a general affection or deeper sense of "true unconditional love" rather than the attraction suggested by "eros." This love is selfless; it gives and expects nothing in return.

--affection or benevolence; specifically (plural) a love feast:—(feast of) charity ([-ably]), dear, love.

… real knowledge and all discernment

What is REAL knowledge ... and what is ALL DISCERNMENT?

ἐπίγνωσις            epignosis

recognition;  precise and correct knowledge

by implication to become fully acquainted with

to fully understand

αἴσθησις              aisthesis

1) perception, not only by the senses but by the intellect

2) cognition, discernment

2a) of moral discernment in ethical matters

1) to perceive

1a) by the bodily senses

1b) with the mind, understand

Discernment is the activity of determining the value and quality of a certain subject or event, particularly the activity of going past the mere perception of something and making detailed judgments about that thing.

Summary

In other words - in your full commitment to your brothers/sisters ... that unconditional love ... apply a TRUE understanding and discernment ... that is, in spite of going deep and KNOWING a person inside and out ... and determining the value with your mind/intellect ... still LOVE them unconditionally and understand HOW to love someone unconditionally.

This ties back to 1:6 "being confident of this, that he who began a good work in you will carry it on to completion until the day of Christ Jesus." God loves us as we press on and He completes us ... so should we to our brothers.

This also ties back to versus 10 and 11:

10 so that you may be able to discern what is best and may be pure and blameless for the day of Christ, 11 filled with the fruit of righteousness that comes through Jesus Christ—to the glory and praise of God.

Best means - LOVE ... and being filled with that fruit ... with knowledge and understanding ... is the fruit that flows from Christ