Sentence:  Comprehending the world casual and transitory, Who list to consider shall never be beguiled, If it be regist'red well in memory; A plain example of worldly vainglory: How in this world there is no <WSD>sickerness</WSD>, But fallible flattery enmixed with bitterness. 
Meaning of the word marked with <WSD> tags:  security; safety; freedom from danger.