The gospel lectionary reading for Lent 4 in Year B is John 3.14–22, the monologue ending of Jesus’ conversation with Nicodemus, which includes perhaps the best-known verse in the New Testament at John 3.16. It is intimidating to talk about such a well-known passage—can we say anything new?—but also to deal with such a large theological subject as the love of God.
But there are some important things to note about the passage—not least that we appear to see a seamless transition from the speech of Jesus to the reflection of the gospel writer, in part demonstrated by the inclusion of reference to the later events of the resurrection and ascension. And although John 3.16 is well known, it is also mostly misread and misinterpreted, so there is plenty to say here as well!
For full details see the article I previously published on this. Here is my video exposition: