Grabbing the attention of the reader is the purpose of the opening sentence of a paper. Think of it as the hook of the fisherman who tries to catch some fish. The first sentence of any written work sets the tone for the whole paper. Writers often make the mistake to overlook this, but the first sentence has to be thought very carefully. This is a skill which has to be learned and practiced. The question is what makes the first sentence capturing? It has to be interesting and engaging. Avoid stating the purpose of the paper in the first sentence. Use a little known fact, or a statement that you intend to challenge, or an anecdote related to the topic. Think of an attention grabber which is relevant for your topic. If you cannot think of one, leave it for later. Often it is better to write the first sentence and the intro right after you finish the whole paper. Make sure that the opening leads the reader gradually to your thesis. Further, keep the intro short, express your opinion clearly and engage the reader. Simply take it slow and don’t panic if you experience a writer’s block!