en_tn/jhn/10/38.md

believe in the works

Here "believe in" is to acknowledge that the works Jesus does are from the Father.

the Father is in me and that I am in the Father

These are idioms that express the close personal relationship between God and Jesus. Alternate translation: "my Father and I are completely joined together as one" (See: rc://en/ta/man/jit/figs-idiom)