Today's scripture has a lot of meaning in so few words. Let's break down each section a little further:
Be on your guard - This is not just looking around but rather it also involves action. Watch out or pay attention and if need be protect, defend and be careful to avoid being tricked or swayed in a different direction.
Stand firm in the faith - stand means that you have secure footing - you are not leaning or wavering. The most important point to make is that when you are standing in the FAITH your secure footing comes from God because we are standing in Him. We are solid as a rock that cannot be moved.
Be men of courage - sometimes God will ask us to do things that we don't want to do; something that might make us nervous or even afraid. We must be brave and trust Jesus. When we are stepping out into the unknown - trust must come first.
Be strong - strength has to do with endurance and being able to continue on for as long as it takes. Here again, this strength must come from God. Draw from His strength through meditating on God's Word and through prayer.
Do everything in love - finally: love. All of the attributes that we have talked about are necessary if we are to do everything in love. Paying attention & protecting = LOVE. Security = LOVE. Bravery = LOVE. Endurance = LOVE. I also think that the use of the word "everything" is significant. If we are to "do everything in love" then that means every single action.
Do everything in love