Passage
`And he was angry, and would not go in, therefore his father, having come forth, was entreating him;
`And he was angry, and would not go in, therefore his father, having come forth, was entreating him;
Luke 15:26 and having called near one of the young men, he was inquiring what these things might be,
Luke 15:27 and he said to him--Thy brother is arrived, and thy father did kill the fatted calf, because in health he did receive him back.
Luke 15:28 `And he was angry, and would not go in, therefore his father, having come forth, was entreating him;
Luke 15:29 and he answering said to the father, Lo, so many years I do serve thee, and never thy command did I transgress, and to me thou didst never give a kid, that with my friends I might make merry;
Luke 15:30 but when thy son--this one who did devour thy living with harlots--came, thou didst kill to him the fatted calf.
The verse centers on "angry", "therefore", "father", "having", "come", "forth", and "entreating". It is saying that the verse draws attention to "angry" and "therefore", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 27's "and he said to him--Thy brother is..." into verse 29's "and he answering said to the father...", so "angry" and "therefore" belong inside that flow. In Luke context, the local focus is Christ, faith, and discipleship.
A plain takeaway is to answer the verse's own emphasis on "angry" and "therefore" with trust shaped by these words, not by a vague optimism outside the passage.