Arthur Schopenhauer,
The World as Will and Representation…
“ If, for example, alone with ourselves, we think over our personal circumstances, and now perhaps vividly present to ourselves the menace of an actually present danger and the possibility of an unfortunate issue, anxiety at once compresses the heart, and the blood ceases to circulate in the veins. But if then the intellect passes to the possibility of an opposite issue, and lets the imagination picture the long hoped for happiness thereby attained, all the pulses quicken at once with joy and the heart feels light as a feather, till the intellect awakes from its dream. ”
