Colleridge and Shelley

Imagery is a huge part of writing in the romantic period and i beliebe colleridge is saying that imagination is allowed, but it should be reasonable because your mind might get too carried away and bring you away from what your life is really like and who and where you are at that stage in your life. I believe he is writing to someone who maybe doubts themselves and dreams big only to be followed by failure. Collergidge is saying it is ok to dream and ok to go after your goals and what you want in life but sit back first and take a look at reality before you go pursuing those dreams that are too big to follow. Anything is reasonable to imagine but to accomplish that feat is an incredible task and thats what i think colleridge is trying to stress.