Obligation is a debt of gratitude for a service or favor. Faith has 5 parts:
Hearing, Receiving, Believing, Speaking and Acting. Imbedded in the Word is the anointing of the Holy Spirit. People who have not heard the Word have no chance or a choice to believe, speak or act. We have an obligation to preach what God has done for us. Faith is not about what we see, but what we believe. We have an obligation to go out in His Name in His Power and share Him.