Here it is:
1 Peter 3:15 "But in your hearts set apart Christ as Lord. Always being prepared to give an answer to everyone who asks you to give the reason for the hope that is in you."
Let's break it down:
But... The context from v14 is a suffering church - both the suffering and the church elements are crucial. 1 Peter is written to a bedraggled mob of asylum seekers who are nonetheless choice in the Father's eyes, purchased and possessed by Christ and sanctified by the Spirit (1:1-2; 2:11). They are suffering under the authorities (2:13ff); suffering at work (2:17ff); suffering in difficult marriages (3:1ff); etc.
In your hearts... "Apologetics" - as Peter defines it - is heart driven.
Set apart Christ as Lord... Here is the imperative of the verse ("being prepared" is an adjective subordinate to this command). The thing we must do is "sanctify"Christ as Lord. We must set Him apart as special in our hearts. We see Peter doing this throughout the letter - consistently calling Christ "precious" (1:19; 2:4,6,7). When our hearts prize Christ as precious, we are ready for apologetics.
Always being prepared... We are not always to be answering but we are always to be prepared. And it's a plural adjective. This suffering community as a whole is to be prepared. Together we are a priesthood (2:9) and this community consists of differently gifted people - some gifted to speak, others to serve (4:10-11). I believe every Christian should be able to put words to their faith, but don't forget the communal aspects - we rely on one another in our answering.
To give an answer... This word - apologia - speaks of responding. Someone else has started this, and the word 'apologia' intimates quite a formal, adversarial situation. (Acts 22:1; 25:16; 1 Cor 9:3; 2 Cor 7:11; Phil 1:7,16; 2 Tim 4:16)
To everyone who asks you... Again, "you" is in the plural. Many people feel guilty that they have never personally been asked about their hope. But in the church body your hopeful suffering belongs to me, just as my answering belongs to you. As a church our suffering with hope will be the apologetic to the world. You can reasonably expect that once or twice in your lifetime a non-Christian will ask you "How did you get through that suffering?" but more generally this verse is fulfilled in the ongoing life of a church where members, (speakers in particular) can say "a couple in our church recently suffered a miscarriage, but the hope of Jesus got them through."
To give the reason for the hope... What's prompting the question is an evident hope - not an evident reason. The thing that's obvious about the Christian is their hope. The thing that's not obvious is the reason - that's why they need to articulate the reason.
That is in you... Notice that the hope to be articulated is in the Christians. It's not in a text book, it's in them. This is the hope that has actually sustained the Christians through their suffering. Therefore equipping Christians apologetically is not about giving people "reasons" they had never considered before the apologist had trained them. Giving an apologia is about putting words to a hope that is already heart-felt and already life-shaping.
Since this is so, a church living out 1 Peter 3:15 is a suffering congregation that prizes Christ as precious and clings to Him in future-looking hope. In this context they rely on one another to articulate such hope to all who ask.
This is what Peter means by apologetics. Is it what we mean?