<p>If a professor or instructor will no longer teach you again (there is no favor to be gained by student), is there any thing wrong to give an appreciation gift with the thank-you card? I have seen teacher appreciation gifts such as a crystal or marble apple etched with the quote To teach is to touch a life forever. Do teachers and professors like this kind of gift and this quote? Thank you for your advice–especially from former and current professors and teachers.</p>