well eros would fall under agappe, because that love turns into unconditional love, the love God has for us, and the love a husband has for his wife.
I've never heard of eros before though. Maybe it's not greek?
Oy. No. Eros doesn't fall under agape. Eros is the antithesis of agape. Agape is selfless, unconditional,
undeserved love. Eros is a selfish, conditional love. You do not have to do anything to receive agape, you can not do anything to deserve agape. You have to meet certain criteria to receive eros.
And there are 4 loves: agape, eros, philia, and storge. Agape and Philia are mentioned in the New Testament. Storge and Eros are not.
agape is the type of love God has for us and the type of love He expects us to display with one another.
eros is the type of love associated with lust.
philia is friendly love. (not to be confused with philio which means "to kiss", or philiadelphia which means "brotherly love")
storge is family love.
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God expects us to display agape, and the most important thing to note about agape is that it is a love NOT based in emotion. No matter how you feel, you can still display agape. Agape is done by decision, and not by feelings. Basically all agape is is giving someone what they need(not want).
The trick is to accept that you cannot fulfill the needs of every person you meet. Also, you should definitely pray to God whenever helping someone to make sure you are fulfilling the needs God wants you to fulfill. For example, while a person may need money, God may not want you to give the person money. God may want you to simply pray for the person. Praying for people is a form of agape, because every person needs to be prayed for. And by your praying, God may send someone else to give the person money that needed money.
In order to love your enemies, simply pray to God and ask Him how you can display agape to those people. I don't like my current president, but I can show him love by praying for him daily and not speaking words of ill toward him. If there is a coworker you dislike, or something of the sort, pray for the coworker. Maybe ask the coworker if there is anything going on in his/her life that you could pray about for him/her. Offer a word of encouragement. Love doesn't have to be this huge, grandiose thing.
Honestly, though, to truly love someone, you need to study the characteristics of God and the characteristics God expects Christians to have. Compassion, mercy, obedience, respect, lawfulness, etc. Love encompasses all of these. Love is compassionate when it needs to be, disciplinary when it needs to be, understanding, strict, merciful, etc. It all depends on the situation and the person, which is why prayer and studying the Word is so important.