This parable is representative of what God tried to do with the children of Israel. God tried to bring the children of Israel to the Promised Land where they would rest. He had made them the chosen nation.
God intended for the Israelites to receive Christ and then He would use them to spread the gospel to other nations. But time after time, the Israelites rejected God's plans.
When Jesus, the ultimate plan of God, came to earth, many of the Jews rejected him and saw him as the carpenter's son or a madman - nothing else. After Jesus ascended to the heavens and the apostles became filled with the Holy Spirit, there were still many Jews who opposed the gospel. They rejected the gift that God had given to them freely.
God used Paul to spread the gospel to the Gentile nations, thus exposing them to the free gift of salvation. It was always part of God's plan, for everyone to receive salvation. There was just a particular way in how it would be done.
The Gentiles were far more receptive to the gospel than the Jews were, who were still fixated on fulfilling the Law.
God is not a respecter of persons. This means that He loves everyone equally - no race more than the other, no gender more than the other, no person over the others.
The love is shed abroad equally and the gift was for everyone. When the Gentiles started receiving the Holy Spirit, the Jews were shocked. Some of them were resentful and tried to impose the Law on the Gentiles but their actions were refuted.
