One of the key points to remember when including context around the texts you are writing about, is to avoid simply attaching it to the end of a sentence. To help weave the context into your essays naturally, try making your point, such as that 'Christina Rossetti uses sibilance in this line to convey her thoughts about religion', and then provide the context, as the evidence pointing to why the writer, in this case Rossetti, would have used such a feature in this way. For example, 'Christina Rossetti uses sibilance in this line to convey her thoughts about religion. This is perhaps as a result of her own strong beliefs in faith and Christianity, as well as society's stricter views on religion at the time of writing in the 19th Century'. You can then build on this, by supporting your argument with evidence from the text, such as examples of words, phrases or quotes, to emphasise the point you are trying to make, while including the context in a natural way. Therefore, the final sentence would look something like this: 'Christina Rossetti uses sibilance in this line to convey her thoughts about religion. This is perhaps as a result of her own strong beliefs in faith and Christianity, as well as society's stricter views on religion at the time of writing in the 19th Century. The sibilance in the phrase...demonstrates how...'. Be sure to be tentative with the contextual opinions. While we can suggest what may have influenced an author to use a certain feature, it is better not to state your contextual opinions as fact, as literature is greatly open to interpretation.