For the problem is simply how can warm passion and a cool sense of proportion be forged together in one and the same soul? Politics is made with the head, not with other parts of the body or soul. And yet devotion to politics, if it is not to be frivolous intellectual play but rather genuinely human conduct, can be born and nourished from passion alone. However, that firm taming of the soul, which distinguishes the passionate politician and differentiates him from the ‘sterilely excited’ and mere political dilettante, is possible only through habituation to detachment in every sense of the word. The ‘strength’ of a political ‘personality’ means, in the first place, the possession of these qualities of passion, responsibility, and proportion.

— Max Weber, Politics as a Vocation, 1918