We need to write a cohesive paragraph because cohesion creates a smooth flow between sentences, making it easier for readers to follow the writer's ideas and thought process. In a cohesive paragraph, each sentence connects logically to the next, with the beginning of each sentence relating to the end of the previous one, allowing readers to quickly grasp the message. This logical flow improves clarity and understanding, ensuring the paragraph conveys a unified and clear message without confusion. Cohesion, together with coherence, helps to organize content and maintain a strong focus on the topic, enhancing the overall quality and readability of the writing.