“A topic that sometimes succeeds in being fully resolved with the help of long explanations in speech or writing, with arguments and letter, but more often fails the harder it is pursued, can be resolved by dumbness in a single hour.”

Misattributed, Jackson's personal book of maxims

It – How Churches and Leaders Can Get It and Keep It (2008, Zondervan)

Cap 14 "Malaysian Crossroads"
Context: You're going to be the leader of a nation, and you have three sons, Hussein. The first-born is Malay, the second-born is Chinese, the third-born is Indian. What we have been witnessing is that the first-born is more favoured than the second or third. Hussein, if you do that in a family, your eldest son will grow up very spoiled. As soon as he attains manhood, he will be in the nightclubs every night because Papa is doting on him. The second and third sons, feeling the discrimination, will grow up hard as nails. Year by year they will become harder and harder, like steel, so that in the end they are going to succeed even more and the eldest will fail even more.

Sketchbook 1946-1949

Broadcast from London (16 April 1937), quoted in Service of Our Lives (1937), pp. 120-121.
1937
Context: When we look round and consider the state of the world to-day, we see on every side bewilderment and doubt... I am no pessimist; I believe that in the end the countries of the world will find peace and prosperity— but that road will be a long and a hard one. For such a journey... above all, there is need of leadership. No one country— no group of countries— is so qualified to provide that leadership as the British Empire... I say this with no idea that we are necessarily better than other people, but because of our experience. For we, the peoples of the Empire, in our relations with one another, have set an example of mutual co-operation in the solution of our problems, such as, I believe, no group of nations has ever before achieved. We have demonstrated to the world in actual practice that difficulties can be resolved by discussion as they cannot be resolved by force.

Source: Pride and Prejudice

Brian Hodgkinson, In Search of Truth.
When he was sixteen, sitting by a lake, he had an experience which set the direction for the rest of his life.

contempt prior to examination.
A View of the Evidences of Christianity (1794).
As quoted or paraphrased in Anglo-Israel or, The British Nation: The Lost Tribes of Israel (1879) by Rev. William H. Poole.
A similar statement apparently derived from this version has become widely attributed to Herbert Spencer, but there are no records of Spencer ever saying or writing it, the first known attributions to him occurring in 1922 as the epigraph to Le Roy Campbell's The True Function of Relaxation in Piano Playing: A Treatise on the Psycho-Physical Aspect of Piano Playing, With Exercises for Acquiring Relaxation: https://books.google.com/books?id=gjMuAAAAYAAJ&printsec=frontcover&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false "There is a principle which is a bar against all information, which is proof against all argument and which cannot fail to keep a man in everlasting ignorance! That principle is condemnation before investigation".
Variant: There is a principle which is a bar against all information, which is proof against all argument, and which cannot fail to keep a man in everlasting ignorance. This principle is, contempt prior to examination.