“True glory strikes root, and even extends itself; all false pretensions fall as do flowers, nor can anything feigned be lasting.”
Book II, section 43
De Officiis – On Duties (44 BC)
Original
Vera gloria radices agit atque etiam propagatur, ficta omnia celeriter tamquam flosculi decidunt nec simulatum potest quicquam esse diuturnum.
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Marcus Tullius Cicero 180
Roman philosopher and statesman -106–-43 BCRelated quotes

“Here, all ye learned, full of all Dispute,
Of true and false Religion lies the Root.”
"On Works of Mercy and Compassion, Considered as The Proofs of True Religion", St. 6
Miscellaneous Poems (1773)
Context: Here, all ye learned, full of all Dispute,
Of true and false Religion lies the Root.
The Mind of Christ, when He became a Man,
With all Its Tempers, forms its real Plan,
The Sheep from Goats distinguishing full well; —
His Love is Heav'n, and Want of It is Hell.

“Not now. Love itself a flower
with roots in a parched ground.”
"Raleigh Was Right" (1940)
Collected Later Poems (1950)
Context: Not now. Love itself a flower
with roots in a parched ground.
Empty pockets make empty heads.
Cure it if you can but
do not believe that we can live
today in the country
for the country will bring us
no peace.

“The glory of life is not never falling. The true glory consists in rising each time we fall.”
Quotations from Gurudev’s teachings, Chinmya Mission Chicago

“The human being, corrupted to the root, can neither desire nor perform anything but evil.”
The Making of Martin Luther, By Richard Rex, p66
Attributed

“We can never add more truth to what is true already, nor make that true which is false.”
p, 125
The History of Oracles, and the Cheats of the Pagan Priests (1688)

“But as to all opinions which do not strike at the root of Christianity, we think and let think.”
"The Character of a Methodist" (1739); in The Works of the Rev. John Wesley in Ten Volumes (1826), Volume IV, p. 407; A portion of this is commonly quoted as "Think and let think.".
General sources
Context: The distinguishing marks of a Methodist are not his opinions of any sort. His assenting to this or that scheme of Religion, his embracing any particular set of notions, his espousing the judgment of one man or of another, are all quite wide of the point. Whosoever therefore imagines, that a Methodist is a man of such or such an opinion, is grossly ignorant of the whole affair; he mistakes the truth totally. We believe indeed, that all Scripture is given by the inspiration of God, and herein we are distinguished from Jews, Turks, and Infidels. We believe the written word of God to be the only and sufficient rule, both of Christian faith and practice; and herein we are fundamentally distinguished from those of the Romish church. We believe Christ to be the eternal, supreme God; and herein we are distinguished from the Socinians and Arians. But as to all opinions which do not strike at the root of Christianity, we think and let think. So that whatsoever they are, whether right or wrong, they are no distinguishing marks of a; Methodist.