"How would you describe the experience of love?"

"Its nature was as transcendent and impossible to truthfully capture with words as it is for all humans I heard of."

"Ok, that's fair, I didn't experience it at all, it was wrong for me to presume, and also expect accurate descriptions when I too am often unable to describe things.
Do you still feel the love, though? Is it part of your motivation?"

"I love him. But there is nothing to be done. I let him kill me, as there was no other choice...or was that just another lie?"

"Well, I can't guarantee success, but 'find a way to reach Shinji again' is exactly the sort of terminal goal that can drag a lot of instrumental ones with it! It's what's called 'convergence'. And i happen to be a person not unfamiliar with interdimensional travel! I am not currently capable of it. And don't know whether I will be. But as an immortal being, the option of 'do stuff, because in another 7 centuries something might come out of it' is always open to you!
There are things like 'have research organizations', and 'have people who trust you and are therefore willing to help you', whatever your goal is. Which some generalize to 'acquire resources', but while it is somewhat true, the process of acquiring resources when you don't have any other goals often ends up evil, or otherwise...game-theoretically inefficient, so I don't advice you to actually internalize this generalization.
I am less immortal, and also have things to do, but if everything goes right for me I could help you. If the world is not destroyed, that is. Which is what I meant by 'things to do'. And what I need help with. Which you can help with a lot, if your power is as great as...well, if I correctly interpreted the communication."

"Do you have a name? Or care about the concept of names at all?"

"There are many names that can refer to me.
Adam. Kaworu Nagisa. The Fifth Child. Tabris."

"Good enough!
How does that quote goes...
You Seem Trustworthy! Would You Care To Join Me On My Noble Quest?!"