Thermometer or Thermostat?

Here’s a thought-provoking question I just saw: Are you a thermometer or a thermostat? A thermometer is affected by its surroundings. Depending on the temperature, it goes up or down. In contrast, a thermostat affects its surroundings. Unlike the thermometer, it controls the environment around it. Do you merely react to what is happening around you, or do you have some kind of impact on it? Are you changing the culture, or is the culture changing you?