1 Timothy 3:9-11

but upholding and fully understanding the mystery [that is, the true doctrine] of the [Christian] faith with a clear conscience [resulting from behavior consistent with spiritual maturity]. These men must first be tested; then if they are found to be blameless and beyond reproach [in their Christian lives], let them serve as deacons. Women must likewise be worthy of respect, not malicious gossips, but self-controlled, [thoroughly] trustworthy in all things.