1漢·魏伯陽《參同契》註：“心猿不定，意馬四馳。”
2《敦煌變文集·維摩詰經講經文》：“卓定深沈莫測量；心猿意馬罷顛狂。”
3 唐·許渾《題杜居士》詩：“機盡心猿伏，神閑意馬行。”
4 語本《維摩經．香積佛品》:以難化之人，心如猿猴，故以若幹種法，制禦其心，乃可調伏。
5 另：《西遊記》中孫悟空又名“心猿”，白龍馬又稱“意馬”。
英文解釋
簡明釋義
a heart like a capering monkey and a mind like a galloping horse -- restless；be prone to outside attractions；fanciful and fickle；harbor monkey-feelings and horse-thoughts；
例句
巨蟹座往往選擇壹種口味的巧克力就很少再心猿意馬。
Cancers often choose one kind of taste in chocolate and rarely then change their minds.
所謂的猴子就是頭腦裏面仍然充滿欲望，心猿意馬。
The monkey is the mind and the lustful desires keep running all over the place inside of it.
但是他心猿意馬，不能自持，他要問自己，難道主人殷勤接待就是世上最神聖的事物嗎？
He was now in imminent danger of asking himself if hospitality were the most sacred thing in the world.
不知所雲式聆聽：妳確信正在談論的主題超過了妳的理解範圍，於是妳起身離開，至少也是心猿意馬。
Over-my-head listening: you are convinced that the subject is beyond you, so you depart, at least in spirit.