Victor Hugo, Les Miserables

Intellectual and moral growth is not less indispensable than material amelioration. Knowledge is a viaticum, thought is of primary necessity, truth is nourishment as well as wheat. A reason, fasting from knowledge and wisdom, becomes puny. Let us lament as over stomachs, over minds which do not eat. If there is anything more poignant than a body agonising for want of bread, it is a soul which is dying of hunger for light.

["Saint Denis," Book Seventh, Chapter IV]