the traveler asks,

what kind of weather will we have today?

the shepherd responds, 

the kind of weather i like

 

the traveler, confused, asks 

how do you know it will be the kind of weather you like?

the shepherd says, 

having found out, sir, i cannot always get what I like,

I have learned to always like what i get,

so i am quite sure we will have the kind of weather I like.