Final answer:
Sir Philip Sidney's Sonnet 44 in Astrophil and Stella contains a reference to Astrophil's problem, the spiritual separation between the speaker and his love in relation to Neoplatonism, gradation, and anadiplosis.
Step-by-step explanation:
In Sonnet 44 of Astrophil and Stella, Sir Philip Sidney references Astrophil's problem of writing poetry that represents what is in his heart. This can be seen in the following line: 'For what care I who calls my thoughts a dream?'
The poem also explores the problem of spiritual separation between Astrophil and Stella, which is a central theme of Neoplatonism. This is evident in the line: 'But my soul's captive, and loves conquest's folie.'
An example of gradation can be found in the stanza: 'Then, lest my liking may too sudden prove,' where Sidney presents a gradual progression of emotions.
An example of anadiplosis is seen in the line: 'Sweet soul, in this sweet censure of my smart.' Here, the word 'sweet' is repeated at the beginning and end of the phrase.