Putting on the Armor of God

What does St. Paul mean about putting on the armor of God in Ephesians 6:10-20? Cale breaks down the meaning of the spiritual weapons we are to equip ourselves with:

“So stand fast with your loins girded in truth,
clothed with righteousness as a breastplate,
and your feet shod in readiness for the Gospel of peace.
In all circumstances, hold faith as a shield,
to quench all the flaming arrows of the Evil One.
And take the helmet of salvation and the sword of the Spirit,
which is the word of God.”

Andrew in Los Angeles asks, “How do you know if you truly love God?”