Fog is related to Low. Low is a synonym of Sad. Sad is the opposite of Glad. 
Question is related to Pray. the first thing you do when you Pray is Concentrate. Remember requires Concentrate. Remember requires Awake. 
Fog <--RelatedTo--> Low <--Synonym--> Sad <--Antonym--> Glad 
Question <--RelatedTo--> Pray --HasFirstSubevent--> Concentrate <--HasPrerequisite-- Remember --HasPrerequisite--> Awake 