Joe Skelly at NRO remembers O'Brien, who died a week ago at 91, and linked O'Brien's 1990 essay in the national Review, A Vindication of Burke.
It's a rich historical essay, and would serve as a fine intro to Burke's work. Just one quote from it:
The grand distinguishing feature of the Reflections is the power of Burke’s insight into the character of the French Revolution, then at an early stage. This insight is so acute as to endow him with prophetic power. He sees what way the Revolution is heading. No one else seems to have done so at the time. The spring and summer of 1790 — the period in which Burke wrote the Reflections — was the most tranquil stage, in appearance, in the history of the Revolution. It was a period of constitution-making, of benevolent rhetoric, and of peaceful jubilation, as in the Déclaration de Paix au Monde on May 21, 1790, or the Fête de la Fédération on July 14, 1790, celebrating the first anniversary of the fall of the Bastille.
Contemplating that attractive scene, in the spring and summer of 1790, most people seem to have assumed that the French Revolution had already taken place, and that all that remained was to reap its benign consequences. Burke sensed that the Revolution was only beginning. In the penultimate paragraph of the Reflections, Burke warned that the French “commonwealth” could hardly remain in the form it had taken in 1790: “But before its final settlement it may be obliged to pass, as one of our poets says, ‘through great varieties of untried being,’ and in all its transmigrations to be purified by fire and blood.”