It does not mean that the norms must always be present in his mind. On the contrary, we do a lot of activities in accordance with the norms without being sufficiently aware of the norms.
Example: Walking on the right side of the road and riding on its left side, showing respect to the national flag when it is hoisted in a programme, respecting elders, dressing in a modest way, etc. Our behaviour is in conformity with the rules that we know. But we are not sure that in our behaviour the norms are always alive at the level of our consciousness.