It is undesirable to believe a proposition when there is no ground whatever for supposing it true
Interpretation
Believing something without evidence is not a rational position.
This quote from Bertrand Russell emphasizes the importance of evidence in forming beliefs. To accept a proposition as true without any supportive grounds is seen as intellectually irresponsible, suggesting that critical thinking and skepticism are essential in the pursuit of knowledge and understanding.
In practice
In a debate about climate change, one might use this quote to emphasize the need for scientific evidence.
St. Paul introduced an entirely novel view of marriage, that it existed primarily to prevent the sin of fornication. It is just as if one were to maintain that the sole reason for baking bread is to prevent people from stealing cake.
Freedom comes only to those who no longer ask of life that it shall yield them any of those personal goods that are subject to the mutations of time.
Of these austerer virtues the love of truth is the chief, and in mathematics, more than elsewhere, the love of truth may find encouragement for waning faith. Every great study is not only an end in itself, but also a means of creating and sustaining a lofty habit of mind; and this purpose should be kept always in view throughout the teaching and learning of mathematics.
At all times, except when a monarch could enforce his will, war has been facilitated by the fact that vigorous males, confident of victory, enjoyed it, while their females admired them for their prowess.
Moreover, the attitude that one ought to believe such and such a proposition, independently of the question whether there is evidence in its favor, is an attitude which produces hostility to evidence and causes us to close our minds to every fact that does not suit our prejudices.
Extreme hopes are born from extreme misery.
Neurotic identity crises come when our defense mechanisms have been too successful and we're encapsulated in the fortress we have constructed with nothing to refresh us in our solitary confinement. So we play the old movies with their stale fears and their unrealistic hopes until we become bored enough to risk disarmament and engagement.
The Bible must be the invention either of good men or angels, bad men or devils, or of God. However, it was not written by good men, because good men would not tell lies by saying 'Thus saith the Lord;' it was not written by bad men because they would not write about doing good duty, while condemning sin, and themselves to hell; thus, it must be written by divine inspiration
Neither a Fortress nor a Maidenhead will hold out long after they begin to parley.
Make women rational creatures, and free citizens, and they will quickly become good wives; - that is, if men do not neglect the duties of husbands and fathers.
If life was a dream, then dying must be the moment when you woke up. It was so simple it must be true. You died, the dream was over, you woke up. That's what people meant when they talked about going to heaven. It was like waking up.
Among the most inestimable of our blessings is that ... of liberty to worship our Creator in the way we think most agreeable to His will; a liberty deemed in other countries incompatible with good government and yet proved by our experience to be its best support.
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