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All opinions are not equal. Some are a very great deal more robust, sophisticated and well supported in logic and argument than others.

 

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The ordinary logic has a great deal to say about genera and species, or in our nineteeth century dialect, about classes. Now a class is a set of objects compromising all that stand to one another in a special relation of similarity. But where ordinary logic talks of classes the logic of relatives talks of systems. A system is a set of objects compromising all that stands to one another in a group of connected relations. Induction according to ordinary logic rises from the contemplation of a sample of a class to that of a whole class; but according to the logic of relatives it rises from the comtemplation of a fragment of a system to the envisagement of the complete system.

 

Charles Sanders Peirce

 

No deeply-rooted tendency was ever extirpated by adverse argument. Not having originally been founded on argument, it cannot be destroyed by logic.

 

George Henry Lewes

 

Great virtues may draw attention from defects, they cannot sanctify them. A pebble surrounded by diamonds remains a common stone, and a diamond surrounded by pebbles is still a gem. No one should attempt to refute an argument by pronouncing the name of some man, unless he is willing to adopt all the ideas and beliefs of that man. It is better to give reasons and facts than names. An argument should not depend for its force upon the name of its author. Facts need no pedigree, logic has no heraldry, and the living should not awed by the mistakes of the dead.

 

Robert G. Ingersoll

 

There has been a great deal of disinformation spread around the world about me, both from inside the orgs and outside; there has been a great deal of rumor and generally a great deal of it is untrue (some of it is true) and I thought that you might like to hear about some things from me and look me over and then you make up your own mind.

 

Ronald (born L. Ron Hubbard DeWolfe

 

Schematically, the argument is as follows. Berkeley says: “Sensible objects must be sensible. A is a sensible object. Therefore A must be sensible.” But if “must” indicates logical necessity, the argument is only valid if A must be a sensible object. The argument does not prove that, from the properties of A other than its being sensible, it can be deduced that A is sensible. It does not prove, for example, that colours intrinsically indistinguishable from those that we see may not exist unseen. We may believe on physiological grounds that this does not occur, but such grounds are empirical; so far as logic is concerned, there is no reason why there should not be colours where there is no eye or brain.

 

George Berkely