Explaining Grace

If your a Calvinist, people may sometimes ask you, "Why has God chosen some people for salvation and not others?" What do you say? I would suggest that you say nothing other than precisely what God has said through the Apostle Paul in Ephesian 2:7.
Your conversation might go something like this,

Question-Asker- Why would God pick some people for salvation and not others?

You- So that in the coming ages He might show the immeasurable riches of His grace।

And remember, always be graceful in explaining God's grace.