Controversial Sayings
652 sayings found from the Medieval era
We absolve all who undertake this journey from all penance for their sins.
The time has now come when you should show your zeal for Christ.
Let no one, on account of his love for his wife or children, hesitate to set out.
We grant to all who undertake this expedition a plenary indulgence.
The holy city of Jerusalem is now held captive by the enemies of God.
Let the cross be your guide and your banner.
Unfortunately, there are no documented controversial, provocative, offensive, politically incorrect, or divisive quotes from Al-Khwarizmi. His surviving works are primarily mathematical and astronomical treatises, which do not typically contain such …
For in the books of the Gentiles, and of the Saracens, and of all unbelievers, there is much that is useful for the understanding of the Scriptures, and for the government of the world, and for the correction of morals, as well as for the sciences.
The greater part of the world is ignorant of the true wisdom, and is ruled by error and deception.
The four greatest stumbling blocks to understanding are: authority, long-standing custom, the sense of the ignorant crowd, and the hiding of one's own ignorance under the show of wisdom.
For without experiment nothing can be sufficiently known. Therefore, he who wishes to be certain of the truths of things must have recourse to experiment.
It is impossible for the human mind to attain to the perfect truth in anything, unless it be aided by the grace of God.
Theology itself, which is the queen of the sciences, cannot be perfect without philosophy.
The study of languages is therefore necessary for all sciences, and especially for theology.
The mathematical sciences are the gate and the key to the understanding of all other sciences.
Ignorance is the mother of all errors.
For the infidels possess many excellent things, and much wisdom, from which we Christians can derive profit.
The multitude of students is very great, and the multitude of books is infinite, but the true knowledge is very rare.
The common herd of students knows nothing of the sciences, but only of words.
The greatest errors in the world arise from the neglect of experiment.