“The smallest act of kindness is worth more than the grandest intention.”

As quoted by Priscianus in Ars Prisciani, Book VI

LOVE (1972)
Variant: Too often we underestimate the power of a touch, a smile, a kind word, a listening ear, an honest accomplishment, or the smallest act of caring, all of which have the potential to turn a life around.

A Narrative of Some of the Lord's Dealings with George Müller Written by Himself, Third Part.
Third Part of Narrative

" Notebook N http://darwin-online.org.uk/EditorialIntroductions/vanWyhe_notebooks.html" (1838) page 36 http://darwin-online.org.uk/content/frameset?pageseq=25&itemID=CUL-DAR126.-&viewtype=text
quoted in [Darwin's Religious Odyssey, 2002, William E., Phipps, Trinity Press International, 9781563383847, 32, http://books.google.com/books?id=0TA81BTW3dIC&pg=PA32]
also quoted in On Evolution: The Development of the Theory of Natural Selection (1996) edited by Thomas F. Glick and David Kohn, page 81
Other letters, notebooks, journal articles, recollected statements
Source: Notebooks

Part I : The History of Opinions Relating to Jesus Christ,
An History of the Corruptions of Christianity (1782)
Context: As the greatest things often take their rise from the smallest beginnings, so the worst things sometimes proceed from good intentions. This was certainly the case with respect to the origin of Christian Idolatry. All the early heresies arose from men who wished well to the gospel, and who meant to recommend it to the Heathens, and especially to philosophers among them, whose prejudices they found great difficulty in conquering. Now we learn from the writings of the apostles themselves, as well as from the testimony of later writers, that the circumstance at which mankind in general, and especially the more philosophical part of them, stumbled the most, was the doctrine of a crucified Saviour. They could not submit to become the disciples of a man who had been exposed upon a cross, like the vilest malefactor. Of this objection to Christianity we find traces in all the early writers, who wrote in defence of the gospel against the unbelievers of their age, to the time of Lactantius; and probably it may be found much later. He says, "I know that many fly from the truth out of their abhorrence of the cross." We, who only learn from history that crucifixion was a kind of death to which slaves and the vilest of malefactors were exposed, can but very imperfectly enter into their prejudices, so as to feel what they must have done with respect to it. … Though this circumstance was "unto the Jews a stumbling-block, and unto the Greeks foolishness," it was to others "the power of God and the wisdom of God." 1 Cor. i. 23, 24. For this circumstance at which they cavilled, was that in which the wisdom of God was most conspicuous; the death and resurrection of a man, in all respects like themselves, being better calculated to give other men an assurance of their own resurrection, than that of any super-angelic being, the laws of whose nature they might think to be very different from those of their own. But, "since by man came death, so by man came also the resurrection of the dead."
Later Christians, however, and especially those who were themselves attached to the principles of either the Oriental or the Greek philosophy, unhappily took another method of removing this obstacle; and instead of explaining the wisdom of the divine dispensations in the appointment of a man, a person in all respects like unto his brethren, for the redemption of men, and of his dying in the most public and indisputable manner, as a foundation for the clearest proof of a real resurrection, and also of a painful and ignominious death, as an example to his followers who might be exposed to the same … they began to raise the dignity of the person of Christ, that it might appear less disgraceful to be ranked amongst his disciples.

"Dead Men’s Dialogue"
Dreamtigers (1960)