THERMOSTAT-----A device that automatically regulates temperature, or that activates a device when the temperature reaches a certain point.
Based upon those definitions, we can confidently say that a THERMOMETER is a device used to measure the environment surrounding it and a THERMOSTAT is a device which not only measures the environment, but activates something which will make proper adjustments to that environment based upon the settings that have been given it.
So, what are you? Are you a THERMOMETER or a THERMOSTAT? Do you measure your surroundings and then go about your business, or do you measure your surroundings and then set about doing something to change them based upon your 'settings' as a Christian?