"The Everlasting No" is Carlyle's name for the spirit of unbelief in God, as embodied in the Mephistopheles of Goethe, which is forever denying the reality of the divine in the thoughts, the character, and the life of humanity, and has a malicious pleasure in scoffing at everything high and noble as hollow and void.

"The Everlasting Yea" is Carlyle's name in the book for the spirit of faith in God in an attitude of clear, resolute, steady, and uncompromising antagonism to the "Everlasting No", and the principle that there is no such thing as faith in God except in such antagonism to the spirit opposed to God.

In Sartor Resartus, the narrator moves from the "Everlasting No" to the "Everlasting Yea," but only through "The Centre of Indifference," a position of agnosticism and detachment.
 Only after reducing desires and certainty, aiming at a Buddha-like "indifference", can the narrator realize affirmation.
 In some ways, this is similar to the contemporary philosopher Søren Kierkegaard's "leap of faith" in Concluding Unscientific Postscript.
"The Everlasting No" is Carlyle's name for the spirit of unbelief in God, as embodied in the Mephistopheles of Goethe, which is forever denying the reality of the divine in the thoughts, the character, and the life of humanity, and has a malicious pleasure in scoffing at everything high and noble as hollow and void.
"The Everlasting Yea" is Carlyle's name in the book for the spirit of faith in God in an attitude of clear, resolute, steady, and uncompromising antagonism to the "Everlasting No", and the principle that there is no such thing as faith in God except in such antagonism to the spirit opposed to God.
In Sartor Resartus, the narrator moves from the "Everlasting No" to the "Everlasting Yea," but only through "The Centre of Indifference," a position of agnosticism and detachment.  Only after reducing desires and certainty, aiming at a Buddha-like "indifference", can the narrator realize affirmation.  In some ways, this is similar to the contemporary philosopher Søren Kierkegaard's "leap of faith" in Concluding Unscientific Postscript.
Thomas Carlyle