Fundamentally speaking

The questions seem to proceed, in rational order:
Am I alone?
Where is the Other, the self, and the other self?
Are they sustainable?

If we cannot - do not - share in suffering, then do we share? (Is it categorically selfishness to share joy and not pain?)

From where does a conception of duty arise, and to what extent are its boundaries self-determined?


Grace must cover it all over.

Weakness

O God, you chose the foolish things of the world to shame the wise;
O God, you chose the weak things of the world to shame the strong!

Authority

"They went to Capernaum, and when the Sabbath came, Jesus went into the synagogue and began to teach. The people were amazed at his teaching, because he taught them as one who had authority, not as the teachers of the law."

(Mark 1:21-22)

Authority: "The power to enforce laws, exact obedience, command, determine, or judge", from French, autorite, "book or quotation that settles an argument," (c. 1230), from
Author: "One who sets forth written statements," from Latin, autor, "father", "one who causes to grow," from Latin, augere, "to increase".

So, authority, at least in some vague etymological degree, means the power or quality of the father. ehhhhh