I like these verses
I know the importance of a pure heart, to be able to experience the Divine. I also know that I still have a lot to purify.
The cause is clear to me. Building a stone wall around me, because I am afraid to open up; hence Jesus his analogy about "be as innocent as a child".
When I follow Truth, Righteousness, Peace and Non-Violence the Love will start flowing
When I avoid lying, cheating, quarreling, violence, jealousy, greediness, envy, malice, hate, anger, desires (worldly) then my heart will unlock
Sarcasm, irony and cynicism are good ways to close my heart, becoming "hard of heart"
Note: "Hard of heart is not wrong". It happened when I was ignorant, and now it takes "heart work" to undo it; to unlock my heart