Possible reason why the heart becomes empt
Empty mind.
Do not let the mind empty for too long. This is clearly the beginning of a disaster in a human's life. This is like a mineral water bottle located in front of the class then anyone who comes will fill it in accordance with his wishes and it is not impossible to fill it with urine.Once you realize that the mind is empty then all you have to do is immediately sing praises and glorify God's name.
False focus
When our minds focus on something of a worldly nature, it is not able to fill that empty space in the heart because matter can not pervade the spirit, but rather the Spirit can enter matter. It is in vain that you try to focus on the pleasures of this world because everything is empty and mere nonsense is about to pass. But the only thing that can fill your heart forever is when you are always in the truth. Focus on doing the truth at all times because the breath we have is the deposit of God who is the true Creator. Praise his name, pray always and meditate on his word. The second truth after this is when we are able to share love with each other in all time and opportunity. Starting from the small things in the family itself. For example, be hospitable (smile, greet, touch, sorry, thank you, please) and be a good listener.