"And one told Jacob"
Rabbi Yosi explains that, "And one told Jacob," refers to Jacob being told that his children would be redeemed. Through this redemption, Jacob would receive both truth and grace, which are two Sfirot, also contained in two higher Chariots, Abraham and Jacob.
To achieve a higher level of spirituality and existence, we sometimes need to "borrow" Light from the Creator in order to use it to awaken and arouse even greater Light in our lives and in this world. This is similar to a businessman borrowing money from a bank for the purpose of building a successful business. In other words, you need money in order to make money. Hence, the primary purpose of this passage is to entrust the readers with Light, so that they may use it to for spiritual purposes and the formation of greater Light.