there is this book by cs lewis called the four loves. it seems like an interesting book and basically it states that love encompasses the following four types: friendship, charity, erotic and romantic love. and i have wondered for ages if love is a sentiment or an obligation. i actually spent quite a long while pondering about it since i couldn't sleep and i think love is both a sentiment and an obligation. when we have feelings for someone, we establish a sort of relationship with that person and after that relationship is affirmed, we are sort of obliged to love that person. i hope i'm making sense. i think i do. or maybe i'm babbling again because i am quite tired.