Answer: well they both come to a realization to be more pure
Explanation: Hazel Grace Lancaster and Augustus Waters first meet at a cancer support group. They bond over the battles they have both endured, causing them to fall in love. ... Hazel opens herself up to Augustus and learns to be more social and loosen up, and Augustus accepts her affection and learns to love again.
They used their ability to focus & work together
I believe everyone is inherently good, but bad circumstances can turn someone evil. For example, in Lord of the Flies Jack was nice at the beginning, but because he wanted to be leader he turned evil. Everyone is always good from the beginning but everything can change just from one circumstance.