απολογια – “apologia” where we get “apologetics” from. Means basically a reasoned Scriptural and doctrinal answer to questions about the faith of Christianity; a defense. I Peter 3:15 “defense” (see below). Contending for the faith means to be involved in apologetic answers for people who have questions or who make attacks or have mis-understandings about Christianity.
αγαπη – “agape” = love
contend earnestly for the faith that was once for all delivered to the saints
. . . keeping yourselves in the love of God . . .
I Peter 3:15
but sanctify Christ as Lord in your hearts, always being ready to make a defense to everyone who asks you to give an account for the hope that is in you, yet with gentleness and reverence;
2 Corinthians 5:14
For the love of Christ controls us . . .