Review class in Negotiable Instruments Law… PROFESSOR: What constitutes valuable consideration? Can anybody here tell me? You, Mr. —, if for instance you execute a promissory note, saying that because of love and affection, you promise to pay P10,000 or order to Ms. ___ who then negotiates to Mr. X. When the note becomes due and demandable, will you pay Mr. X? STUDENT: No, sir. PROFESSOR: Why not? STUDENT: Because love and affection is not a valuable consideration. PROFESSOR: You mean to say that your love has no value at all?