“They must not fear, nor regard as sin, or take to heart any evil impulses to sin or to blasphemy, or doubts about the Sacrament, or any other such ugly temptations; for to experience these temptations defiles the soul no more than the bark of a dog or the bite of a flea. They trouble the soul but do not harm it provided a man puts them aside and ignores them. It does no good to struggle against them, or to try and master them by force, for the more a person struggles against them, the more persistent they become.”
Book I, ch. 38 (p. 43)
The Ladder of Perfection (1494)
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Walter Hilton 11
English Augustinian mystic. 1340–1396Related quotes

§ IV
1910s, At the Feet of the Master (1911)
Context: Of all the Qualifications, Love is the most important, for if it is strong enough in a man, it forces him to acquire all the rest, and all the rest without it would never be sufficient. Often it is translated as an intense desire for liberation from the round of births and deaths, and for union with God. But to put it in that way sounds selfish, and gives only part of the meaning. It is not so much desire as will, resolve, determination. To produce its result, this resolve must fill your whole nature, so as to leave no room for any other feeling. It is indeed the will to be one with God, not in order that you may escape from weariness and suffering, but in order that because of your deep love for Him you may act with Him and as He does. Because He is Love, you, if you would become one with Him, must be filled with perfect unselfishness and love also.
In daily life this means two things; first, that you shall be careful to do no hurt to any living thing; second, that you shall always be watching for an opportunity to help.
First, to do no hurt. Three sins there are which work more harm than all else in the world — gossip, cruelty, and superstition — because they are sins against love. Against these three the man who would fill his heart with the love of God must watch ceaselessly.

Source: Quotes from secondary sources, Dictionary of Burning Words of Brilliant Writers, 1895, P. 391.

1900s, Letter to Winfield T. Durbin (1903)

Source: The moon and the bonfire (1950), Chapter XVIII, p. 107

The Notebooks of Leonardo da Vinci (1883), XIV Anatomy, Zoology and Physiology
Source: The Fall of Hyperion (1990), Chapter 12 (p. 94)