Step 1: Understanding the Concept:
This question is about the subject of the poem 'Thinner Than a Crescent' by the poet Vidyapati.
Step 2: Detailed Explanation:
The poem describes the intense sorrow and longing of a lover who is separated from her beloved. The poem is narrated by a friend who is reporting this condition to the beloved.
The characters are from Hindu mythology. The beloved is Lord Krishna (also referred to as Madhava). The one who is pining for him is his consort, Radha.
The poem details how Radha's constant thoughts of Krishna and her grief over his absence have caused her to waste away physically, becoming "thinner than the crescent in the sky."
Step 3: Final Answer:
The poem tells us that Radha thinks about Krishna all the time.