The word 随心所欲 is formed by the sequential combination of four characters: 随, meaning "to follow" or "according to"; 心, meaning "heart" or "mind"; 所, a structural particle that nominalizes the following verb, here meaning "that which"; and 欲, meaning "desire" or "wish". These characters are arranged in a syntax where 随 governs 心, and 所欲 acts as the object, creating the literal meaning "follow what the heart desires", which conveys doing as one pleases.