John 3:16
For God so loved the whole world, that He gave his one and only son, that whoever believes in Him shall not perish but have everlasting life.
I know this is a very common verse, but it is really important. With this verse, you can explain a lot of things, and answer some seemingly though questions.
1) Why did God let Jesus die on the cross?
2) Why didn't Jesus get himself off the cross?
3) Who gave us everlasting life?
There are many more questions and answers you could get from this verse. The verse itself is seemingly simple, but God's love for us is very complex! We should be grateful for his love for us.
