let's just use logic....
what is the opposite of determinism? non-determinism, meaning the inability to foresee or predict the outcome of anything. this is also defined as chaos. but lets look around us. we are able, with varying degress of probablity, to determine, predict and foresee through time the outcome of everything. probablity is a fuction of information. the less information that is known about a thing, the greater the probability of outcomes. therefore, for example, if all information is known about a coin flip, which includes the coin, tosser and environment, then the outcome can be determined with 100% accuracy. probablity, chance and free will are artifacts created due to a lack of information.
this is why it is of upmost importance to know thyself. once we understand ourselves, our purpose in this universe becomes clear - like a coin flip.