The phrase "be beyond one" usually means that something is too difficult or impossible to understand or achieve. There are several synonyms for this phrase which convey a similar meaning. For instance, "be above one" means the same thing and is often used in reference to something that is beyond one's comprehension or abilities. "Be out of one's reach" and "be inaccessible" are two other synonyms which indicate that something is beyond one's grasp. "Be infeasible" and "be impractical" are other synonyms that imply that something is unattainable or impossible to accomplish. All of these phrases convey the idea that something is beyond one's limits or capability.