The Intellect engages us in the pursuit of Truth. The Passions impel us to Action.

[Cogitatio in vero exquirendo maxime versatur, appetitus impellit ad agendum.]

Marcus Tullius Cicero (106-43 BC) Roman orator, statesman, philosopher
De Officiis [On Duties; On Moral Duty; The Offices], Book 1, ch. 35 / sec. 132 (44 BC) [Barnes (1814)]

(Source (Latin)). Alternate translation:

Reflection is chiefly employed in the investigation of truth, appetite impels to action.
[tr. McCartney (1798)]

Reflection chiefly applies itself in the search of truth. Appetite prompts us to action.
[tr. Edmonds (1865)]

Thought is occupied chiefly in seeking the truth; impulse urges to action.
[tr. Peabody (1883)]

Thought is employed in the discovery of truth, appetite impels to action.
[tr. Gardiner (1899)]

Thought is occupied chiefly with the discovery of truth; impulse prompts to action.
[tr. Miller (1913)]

Thought is mostly expended in seeking out the truth, passion urges men to action.
[tr. Edinger (1974)]