does GOD really cares? how do we know?

..In my own personal experience, I know and I believe that God cares for me and for all the people I've loved.. I grew up acknowledging Him as the only one whom I can trust and I can rely on because I know that He can do everything for me.. And I have proven them several times.. I reached Him through prayers and I am answered.. Of course, sometimes, I'm answered differently.. Well, I would say your own personal experience will prove how God cares.. However, it again depends on your personal relationship with Him.. Of course, like if you are entering a house, you have to knock before you will be answered.. That's the same with God.. If you won't knock, He won't answer.. So I would say that you can only prove His might and love if you establish a serious relationship with Him..