The central message of this sermon is that faith is not just a single act, but rather a ongoing process of trusting and obeying God despite uncertainty and lack of clarity about the future. The speaker argues that Abraham's journey from Ur to Canaan was not a one-time act of faith, but rather the beginning of a lifelong commitment to living by faith. This life of faith is characterized by a sense of homelessness and wandering, as seen in Abraham's decision to live in tents like a stranger in a foreign country. The speaker suggests that this is because the ultimate goal of faith is not to achieve earthly success or comfort, but rather to attain union with God in heaven. In essence, the sermon advances the idea that true faith requires an ongoing trust and reliance on God, even when it's hard to see the end result, and that our ultimate home is not on this earth, but in the presence of God. The takeaway for listeners is that faith is not just about making a bold move or taking a leap of faith, but rather about embracing a lifelong journey of trusting and following God, even when we don't have all the answers.