Secure is a synonym of Reliable. Reliable is similar to Certain. Certain is related to Being. Being is related to Purpose. 
Sigh is related to Love. you are likely to find Human in/at/on Love. Patient is a type of Human. Patient is related to Client. 
Secure <--Synonym--> Reliable <--SimilarTo--> Certain <--RelatedTo--> Being <--RelatedTo--> Purpose 
Sigh <--RelatedTo--> Love <--AtLocation-- Human <--IsA-- Patient <--RelatedTo--> Client 