Matthew 6:33-Seek firs the kingdom of God and his righteousness, and all these things will be added to you.
The gospel is both physical and spiritual. Jesus came entered into human history, fully indwelling the physical from birth to death. Therefore, the gospel is both a spiritual and a physical thing. One of the greatest ways in which we, as people who have fallen short of the glory of God, fall short is how we treat our physical bodies; particularly sexually. For more information on the importance of abstinence (abstaining from sex outside of marriage), as A.C. Green was detailing, click on the link below for an article by Tim Keller on sex and the gospel.