“The one who acts without knowledge, destroys and ruins more than he rectifies.”

— Muhammad al-Taqi

Majlisi, Bihārul Anwār, vol.78, p. 364
Regarding Knowledge & Wisdom, General

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Muhammad al-Taqi 25

ninth of the Twelve Imams of Twelver Shi'ism 811–835

John Brunner book Stand on Zanzibar

continuity (39) “Better To Be a Volcano”
Stand on Zanzibar (1968)

“A little knowledge that acts is worth infinitely more than much knowledge that is idle.”

Khalil Gibran (1883–1931) Lebanese artist, poet, and writer

“No one does more harm in the Church than he who has the title or rank of holiness and acts perversely.”

Pope Gregory I (540–604) Pope from 590 to 604

Source: The Book of Pastoral Rule, p.32

“He who studies without passion will never become anything more than a pedant. We must approach knowledge from the inside; inspired by passion.”

Stefan Zweig (1881–1942) Austrian writer

Confusion of Feelings or Confusion: The Private Papers of Privy Councillor R. Von D (1927)

“A man who is used to acting in one way never changes; he must come to ruin when the times, in changing, no longer are in harmony with his ways.”

Niccolo Machiavelli book The Prince

Source: The Prince

“Wisdom entereth not into a malicious mind, and that knowledge without conscience is but the ruin of the soul”

Francois Rabelais book Gargantua and Pantagruel

Source: Gargantua and Pantagruel (1532–1564), Pantagruel (1532), Chapter 8 
Variant translation: Wisdom entereth not into a malicious mind, and science without conscience is but the ruin of the soul.
Original: Science sans conscience n'est que ruine de l'âme.
Context: But because, as the wise man Solomon saith, Wisdom entereth not into a malicious mind, and that knowledge without conscience is but the ruin of the soul, it behoveth thee to serve, to love, to fear God, and on him to cast all thy thoughts and all thy hope, and by faith formed in charity to cleave unto him, so that thou mayst never be separated from him by thy sins. Suspect the abuses of the world. Set not thy heart upon vanity, for this life is transitory, but the Word of the Lord endureth for ever. Be serviceable to all thy neighbours, and love them as thyself. Reverence thy preceptors: shun the conversation of those whom thou desirest not to resemble, and receive not in vain the graces which God hath bestowed upon thee.