Nothing can be more evident, from the sequel of Abimelech's history, and which this chapter relates, than that there was a great deal of a prophetic spirit in this declaration of Jotham. The mutual destruction of Abimelech and the Shechemites, set forth this very strikingly.
Judges 9:16-20
16 Now therefore, if ye have done truly and sincerely, in that ye have made Abimelech king, and if ye have dealt well with Jerubbaal and his house, and have done unto him according to the deserving of his hands;
17 (For my father fought for you, and adventuredf his life far, and delivered you out of the hand of Midian:
18 And ye are risen up against my father's house this day, and have slain his sons, threescore and ten persons, upon one stone, and have made Abimelech, the son of his maidservant, king over the men of Shechem, because he is your brother;)
19 If ye then have dealt truly and sincerely with Jerubbaal and with his house this day, then rejoice ye in Abimelech, and let him also rejoice in you:
20 But if not, let fire come out from Abimelech, and devour the men of Shechem, and the house of Millo; and let fire come out from the men of Shechem, and from the house of Millo, and devour Abimelech.