When all the judges (or justices) agree on a decision, a majority opinion is written for the entire court?

Yes.  Reasons are to look at later cases, through judicial review (precedent cases.)  

the two sets of lines are :

and remember beauty,five-wits,strength,and discretion ,they all at the last do everyman forsake (to leave forever ) for after death amends may no man make,for then mercy and pity doth him forsake.(to leave forever )