To give a causal explanation of an event means to deduce a statement which describes it, using as premises of the deduction one or more universal laws, together with certain singular statements, the initial conditions ... We have thus two different kinds of statement, both of which are necessary ingredients of a complete causal explanation.
Interpretation
A complete causal explanation requires both universal laws and specific conditions.
Karl Popper's quote emphasizes the importance of combining general laws with particular circumstances to fully explain an event. It illustrates the idea that understanding causality involves not just the rules that govern phenomena, but also the specific situational factors that lead to a particular outcome.
In practice
During a lecture on scientific methodology, this quote could illustrate the relationship between general theories and specific instances.
The growth of our knowledge is the result of a process closely resembling what Darwin called 'natural selection'; that is, the natural selection of hypotheses: our knowledge consists, at every moment, of those hypotheses which have shown their (comparative) fitness by surviving so far in their struggle for existence, a competitive struggle which eliminates those hypotheses which are unfit.
If you can't say it simply and clearly, keep quiet, and keep working on it till you can.
No particular theory may ever be regarded as absolutely certain.... No scientific theory is sacrosanct.
The belief in a political Utopia is especially dangerous. This is possibly connected with the fact that the search for a better world, like the investigation of our environment, is (if I am correct) one of the oldest and most important of all the instincts.
A rationalist is simply someone for whom it is more important to learn than to be proved right; someone who is willing to learn from others - not by simply taking over another's opinions, but by gladly allowing others to criticize his ideas and by gladly criticizing the ideas of others
Thus science must begin with myths, and with the criticism of myths; neither with the collection of observations, nor with the invention of experiments, but with the critical discussion of myths, and of magical techniques and practices.
Let me give you a word of the philosophy of reform. The whole history of the progress of human liberty shows that all concessions yet made to her august claims, have been born of earnest struggle. The conflict has been exciting, agitating, all-absorbing, and for the time being, putting all other tumults to silence. It must do this or it does nothing. If there is no struggle there is no progress.
They whose activity of imagination is often shifting the scenes of expectation, are frequently subject to such sallies of caprice as make all their actions fortuitous, destroy the value of their friendship, obstruct the efficacy of their virtues, and set them below the meanest of those who persist in their resolutions, execute what they design, and perform what they have promised.
faith without doubt is addiction
I could not help feeling that they were evil things-- mountains of madness whose farther slopes looked out over some accursed ultimate abyss. That seething , half-luminous cloud-background held ineffable suggestions of a vague, ethereal beyondness far more than terrestrially spatial; and gave appalling reminders of the utter remoteness, separateness, desolation, and aeon-long death of this untrodden and unfathomed austral world.
Many of us Christians have become extremely skillful in arranging our lives so as to admit the truth of Christianity without being embarrassed by its implications. We arrange things so that we can get on well enough without divine aid, while at the same time ostensibly seeking it. We boast in the Lord but watch carefully that we never get caught depending on Him.
Man, no doubt, owes many other moral duties to his fellow men; such as to feed the hungry, clothe the naked, shelter the homeless, care for the sick, protect the defenseless, assist the weak, and enlighten the ignorant. But these are simply moral duties, of which each man must be his own judge, in each particular case, as to whether, and how, and how far, he can, or will perform them.
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