Answer:
Importance of following one's dreams
Importance of family commitment
Step-by-step explanation:
Importance of following one's dreams is the major theme of O'Neill's "Beyond the Horizon".
In this excerpt (Act 1, Scene 1), the reference to the theme of "family commitment" appears when talking to each other both brothers show respect and care for each other.
Andrew: I’ll miss you as much as anybody, I guess. You see, you and I ain’t like most brothers—always fighting and separated a lot of the time.
Robert: (with feeling) It’s just as hard for me, Andy—believe that! I hate to leave you and the old folks—but—I feel I’ve got to.
The theme of "following one's dreams" is presented in Robert's last lines in this excerpt i.e. "I feel I’ve got to. There’s something calling me—— (He points to the horizon) Oh, I can’t just explain it to you, Andy."