Princes shall come out of Egypt; Ethiopia shall soon stretch out her hands unto God. Psalm 68:31.  {CC 236.1}       Throughout his ministry Isaiah bore a plain testimony concerning God's purpose for the heathen. Other prophets had made mention of the divine plan, but their language was not always understood. To Isaiah it was given to make very plain to Judah the truth that among the Israel of God were to be numbered many who were not descendants of Abraham after the flesh. This teaching was not in harmony with the theology of his age, yet he fearlessly proclaimed the messages given him of God and brought hope to many a longing heart reaching out after the spiritual blessings promised to the seed of Abraham. . . .  {CC 236.2}        Often the Israelites seemed unable or unwilling to understand God's purpose for the heathen. Yet it was this very purp ...