Prudent men, when so great an object as the security of Government, or even its peace, is at stake, will not run the risque of a decision which may be fatal to it. They who can read the political sky will see an hurricane in a cloud no bigger than an hand at the very edge of the horizon, and will run into the first harbour. No lines can be laid down for civil or political wisdom.
 Edmund Burke, Thoughts on the Cause of the Present Discontents (1770). copy citation

Context

“The controversy is about that degree of good humour in the people, which may possibly be attained, and ought certainly to be looked son While some politicians may be waiting to know whether the sense of every individual be against them, accurately distinguishing the vulgar from the better sort, drawing lines between the enterprizes of a faction and the efforts of a people, they may chance to see the Government, which they are so nicely weighing, and dividing, and distinguishing, tumble to the ground in the midst of their wise deliberation. Prudent men, when so great an object as the security of Government, or even its peace, is at stake, will not run the risque of a decision which may be fatal to it. They who can read the political sky will see an hurricane in a cloud no bigger than an hand at the very edge of the horizon, and will run into the first harbour. No lines can be laid down for civil or political wisdom. They are a matter incapable of exact definition.But, though no man can draw a stroke between the confines of day and night, yet light and darkness are upon the whole tolerably distinguishable. Nor will it be impossible for a Prince to find out such a mode of Government, and such persons to administer it, as will give a great degree of content to his people;” source