The duty of the lighthouse keeper is to keep the light burning no matter what happens, so the ships will be warned of the presence of dangerous rocks. if a shipwreck should occur near the lighthouse, even though he would like to aid in the rescue of the crew and passengers, the lighthouse keeper

Stay at his light

Explanation:

It is important that the lighthouse keeper resists the urge to help in the shipwreck and instead stays at his light. This is because ships are likely to continue approaching the shore. If the lighthouse keeper abandons his post, these other ships could suffer from an accident as well due to the lack of guidance in their navigation.

the missing space is phylum