Answer:
humans are uncertain of their fate
Step-by-step explanation:
The word "security" as used in the passage suggests that humans are uncertain of their fate.
From the first paragraph, it is narrated that it is no security to wicked men that there are no immediate means of death and also the second paragraph which narrates that it is no security to a natural man that he is in health and can die at anytime.
From both paragraphs, this shows the uncertainty of fate.