> 
> **To laugh often and much**;  
> 
> **to win the respect of intelligent people  
> 
>  and the affection of children**;  
> 
>  to earn the appreciation of honest critics  
> 
>  and endure the betrayal of false friends;  
> 
>  to appreciate beauty;  
> 
>  to find the best in others;  
> 
>  to leave the world a bit better,  
> 
>  whether by a healthy child,  
> 
>  a garden patch or a redeemed social condition;  
> 
>  to know that even one life has breathed easier  
> 
>  because you have lived.  
> 
>   
> 
>  This is to have succeeded.
> 
> 
> 

Are these sentences called something specific, in grammar? These don't seem to have any subject. Can they be thought of as complete sentences?