The central message of this sermon is that true growth and maturity in one's spiritual life, as well as in marriage, can only be achieved by aligning one's experience with their positional identity in Christ. This means recognizing that God has already joined them to Him and to their spouse in a spiritual oneness, and that the goal is not to somehow earn or work towards this unity, but rather to submit to and rely on it as a reality that already exists. The sermon highlights the importance of discernment and prayer in navigating cultural and political issues, and cautions against being swayed by external pressures or false standards. Ultimately, the takeaway is that true growth and maturity involve recognizing one's dependence on God and their spouse, and moving towards spiritual oneness, rather than growing apart from this reality.