Is there any proverb or idiom that conveys this meaning:" Don't rely on this world, since it is not loyal to man forever, today is in your hand, tomorrow in mine" ( actually it is a Persian saying and it implies that money, position, properties, power,... are not stable or eternal, so don't bond to /don't rely on this worldly world and just act and live humanly).

For examples: The dictators In other countries ,should learn a serious lesson from what happened to Gaddafi: the world is bound to no man and the six feet of earth make all men equal.

( I found this Jewish proverb, "the world is bound to no man", but I'm not sure if it is used by English speakers or not)

Ps: in that Pessian saying," the world "has been resembled to an unfaithful or unreliable person whom you shouldn't expect to be with you forever! Maybe tomorrow aboundens you and goes with another one!, (in fact the world means "life's good opportunities")