Thought is occupied chiefly with the discovery of truth; impulse prompts to action. We must be careful, therefore, to employ our thoughts on themes as elevating as possible and to keep our impulses under the control of reason.
 Marcus Tullius Cicero, On Duties (44 BC). copy citation

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Author Marcus Tullius Cicero
Source On Duties
Topic discovery action
Date 44 BC
Language English
Reference
Note Translated by Walter Miller
Weblink http://www.constitution.org/rom/de_officiis.htm

Context

“And we shall not fall in this if we guard against violent excitement or depression, and if we keep our minds intent on the observance of propriety.
{132} Our mental operations, moreover, are of two kinds: some have to do with thought, others with impulse. Thought is occupied chiefly with the discovery of truth; impulse prompts to action. We must be careful, therefore, to employ our thoughts on themes as elevating as possible and to keep our impulses under the control of reason. XXXVII.
The power of speech in the attainment of propriety is great, and its function is twofold: the first is oratory; the second, conversation. Oratory is the kind of discourse to be employed in pleadings in court and speeches in popular assemblies and in the senate; conversation should find its natural place in social gatherings, in informal discussions, and in intercourse with friends; it should also seek admission at dinners.” source