Is it in the heart or in the mind

Life is so good,predictable and unpredictable. We learn lot of stuff almost every second. We choose to go with what we see and believe to be true and act accordingly.
There are systems,rules,content to be followed. We come up with what we see and think will get us ahead but we still stumble upon our own means.
As for our deeds and actions even though you act on your own and for your own benefits it is not like that.
Everything is interrelated and inter grated.
Please help me on:
-What is holding the universe?
-What is giving the sun energy?
-why we eat?
I hope we all know our physical body. Let's say your bones says that they don't want to be part of yourself,will you be you?