La mejor forma de aprender es enseñando...

Docendo discimus — "the best way to learn is to teach"

I am a retarded learner (someone that learns in the process of teaching)  (John Archibald Wheeler )

Docendo discimus, (Latin "by teaching, we learn"). 

Seneca the Younger (c. 4 BC – 65 AD) 

says in his letters to Lucilius Junior 

that we are learning if we teach (epistulae morales I, 7, 8). 

R. Rosende