Marcus Porcius Cato Maior idézet

In bitter criticism of the prevalent domination of women (The Classical weekly, Vol. 25–26, 1932, p. 273).
Quoted in Plutarch Apophthegmata regum et imperatorum, in Greek.

This is composed of excerpts (with some paraphrasing) from a speech of Cato as reported in Livy's History of Rome, book 34, sections 2-4 http://mcadams.posc.mu.edu/txt/ah/Livy/Livy34.html.
Misattributed

Cato's advice to orators (as quoted in Julius Victor, Art of Rhetoric. p. 197, Orell.; see also Wilhelm Sigismund Teuffel, Teuffel's History of Roman literature, Vol. 1 (1873), p. 158)
Cf. Dionysius Halicarnassensis, De Isocrate, ch. 12: "βούλεται δὲ ἡ φύσις τοῖς νοήμασιν ἕπεσθαι τὴν λέξιν, οὐ τῇ λέξει τὰ νοήματα." [Νature has it that style is in the service of thought, not the other way around.]
Variant translations:
Stick to your subject, and words will follow.
Get hold of the matter, the words will come of themselves.
Lay hold of the subject, and the words will follow.
Keep to the subject and the words will come.
Grasp the point, the words will follow.
Seize the subject; the words will follow.
Stick to the point; the words will follow.
Master the facts; the words will follow.
Lay hold of the substance, the words will follow.
Hold fast to the matter, the words will come.
Hang onto your meaning, and the words will come.
Have a grip of your theme and the words will come.
Hold the idea and the words will follow.
Stick to the meaning, and the words will take care of themselves.

Attributed to Cato in Plutarch, Parallel Lives 19:4 http://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A2008.01.0013%3Achapter%3D19.
Original Greek: ‘μᾶλλον γὰρ,’ ἔφη, ‘βούλομαι ζητεῖσθαι, διὰ τί μου ἀνδριὰς οὐ κεῖται ἢ διὰ τί κεῖται’

Introduction: of the dignity of the farmer
De Agri Cultura, about 160 BC

Of the duties of the owner
De Agri Cultura, about 160 BC

Of buying a farm; Cited in John Claudius Loudon (1825) An Encyclopædia of Agriculture. Part 1. p. 14
Loudon commented: In the time of Cato the Censor, the author of The Husbandry of the Ancients observed, though the operations of agriculture were generally performed by servants, yet the great men among the Roman continued to give particular attention to it, studied its improvement, and were very careful and exact in the management of nil their country affairs. This appears from the directions given them by this most attentive farmer. Those great men had both houses in town, and villas in the country; and, as they resided frequently in town, the management of their country affairs was committed to a bailiff or overseer. Now their attention to the culture of their land and to every other branch of husbandry, appears, from the directions given them how to behave upon their arrival from the city at their villas.
De Agri Cultura, about 160 BC

Disticha, Bk. ii, No. 26. The Distichs of Cato were long attributed to Cato the Elder but probably are the work of a much later author called Dionysius Cato from the 3rd or 4th century A.D.
Misattributed

Moreover, I consider that Carthage should be destroyed.
Cato was convinced that the security of Rome depended on the annihilation of Carthage and he urged his countrymen to the Third Punic War. Towards the end of his life he ended all of his speeches in the Roman senate with these words.

Of the duties of the owner
De Agri Cultura, about 160 BC

As quoted by Seneca (Epistles, 94)

Of the duties of the housekeeper
De Agri Cultura, about 160 BC

Apothegms (no. 247)

On the duties of the overseer
De Agri Cultura, about 160 BC