Do not take life's experiences too seriously. Above all, do not let them hurt you, for in reality they are nothing but dream experiences... If circumstances are bad and you have to bear them, do not make them a part of yourself. Play your part in life, but never forget that it is only a role.
above all: 特に、とりわけ in reality: 実は、現実には nothing but: = only circumstance: 状況 bear: ～に耐える