Read the sentence.
if you do not want to learn to juggle matthew will show you where you can wait.
after which word should a comma be placed?
matthew
if
juggle
learn

If you do not want to learn to juggle, Matthew will show you where you can wait. it would be after juggle because it can be reversed As "Matthew will show you where you can wait, if you do not want to learn to juggle. 
Does it make sense?  

Ifound this on google “preview — long walk to freedom by nelson mandela. “i am fundamentally an optimist. whether that comes from nature or nurture, i cannot say. part of being optimistic is keeping one's head pointed toward the sun, one's feet moving forward.” i hope this you for what your looking for.

A. they give the reader hope. if the whole book was dark & unhopeful it’d be a little less interesting, little moments make it more interesting to read because then you want to know what happens. if it’s all dark there’s no point in reading if you already know the outcome of it.