Reason and the ability to use ...

Reason and the ability to use it are two separate skills.
 Franz Grillparzer

Quotes from the same author

Genius unrefined resembles a flash of lightning, but wisdom is like the sun.
 Franz Grillparzer
There shall be no slave in your home, male or female: Least of all the mother of your son.
 Franz Grillparzer
Swear words and profanities are mere abbreviations of speech, similar to the abbreviations in writing.
 Franz Grillparzer
Caution is the daughter of circumspection, but she tends to outgrow her mother.
 Franz Grillparzer
If human beings are immortal, so are animals. If matter has the ability to remember, it also has the ability to think.
 Franz Grillparzer