There is one evident, indubitable manifestation of the Divinity, and that is the laws of right which are made known to the world through Revelation.
— Leo Tolstoy

Change is one thing, progress is another. Change is scientific, progress is ethical; change is indubitable, whereas progress is a matter of controversy.
Bertrand Russell indubitably quote

Organic life, we are told, has developed gradually from the protozoon to the philosopher, and this development, we are assured, is indubitably an advance. Unfortunately it is the philosopher, not the protozoon, who gives us this assurance.
— Bertrand Russell

Indubitably, Magic is one of the subtlest and most difficult of the sciences and arts. There is more opportunity for errors of comprehension, judgment and practice than in any other branch of physics.
— Aleister Crowley

The Church welcomes technological progress and receives it with love, for it is an indubitable fact that technological progress comes from God and, therefore, can and must lead to Him.
— indubitably quotation by Pius XII Pacelli