Becoming Salt and Light
The saltiness of salt is not only its "flavour" but the very essence of what it is. If salt loses its saltiness, it is no longer itself. The struggle to respond to the light is the call to become light, not to become other than who we are, but to become our true selves. To discover our true life and live it. Live it from the centre of ourselves. Live it to the full. Live it in a manner which makes us life-giving for others.
For the Christian (Mark 9.49 and previous), becoming salt and light is the process of self-discovery, self-expression and self-revelation. It is a process which happens in private and also in relationship. It makes us fertile, compassionate and generous.