Each line is one thing said. Authors named first use those words. Those after “in nearly the same words” say the same thing differently; point at a name to see their words.
What It Is
St. Thomas, after Aristotle: “Chastity takes its name from the fact that reason "chastises" concupiscence, which, like a child, needs curbing”
It excludes, or it moderates, by state of life: “Excludes or moderates: for according to the diverse state in which someone is found, the precept of chastity either prohibits and excludes every venereal delectation altogether, or prescribes only its moderation.”
Noldin n. 1In nearly the same words: Merkelbach II, n. 998
What It Is Not
Not here the chastity of the mind joined to God: “the word "chastity" is employed metaphorically”
That spiritual chastity belongs above all to charity: “the essence of this chastity consists principally in charity and the other theological virtues, whereby the human mind is united to God”
Purity (pudicity) is not another virtue: “Pudicity is ordered to chastity, not as a virtue distinct from it, but as expressing a certain circumstance of chastity.”
A virtue, and also a fruit: “Chastity is a virtue in so far as it works in accordance with reason, but in so far as it delights in its act, it is reckoned among the fruits.”
The desires within: “The proximate matter of chastity is the interior motions of the appetite concerning venereal things”
Merkelbach II, n. 996In nearly the same words: McHugh-Callan n. 2486
Why they need a virtue: “Venereal pleasures are more impetuous, and are more oppressive on the reason than the pleasures of the palate: and therefore they are in greater need of chastisement and restraint”
Consent feeds it: “if the concupiscence of such pleasures be fostered by consenting to it, it will wax very strong, as in the case of a child left to his own will”
St. Augustine, in St. Thomas, on chastity kept under violence: “not even the violence of another's lust can deprive her body of its holiness, which is safeguarded by her persevering continency”
Supernatural, or acquired: “Now chastity is: a supernatural virtue inclining man to moderate the appetite and use of venereal things.”
Wouters n. 14In nearly the same words: Vermeersch n. 22
Where It Belongs
A species of temperance, not abstinence: “chastity, which is about venereal pleasures, is a distinct virtue from abstinence, which is about pleasures of the palate”
A long fight, a bloodless martyrdom: “St. Augustine declares that the preservation of chastity is the greatest victory achieved by the Christian, and requires the hardest struggle.”
No wrong to the human race: “sufficient provision is made for the human multitude if some devote themselves to carnal generation, while others, abstaining from this, devote themselves to the contemplation of divine things”
Yet not the greatest of the virtues: “the theological virtues as well as the virtue of religion, the acts of which consist in being occupied about Divine things, are preferable to virginity”
Imperfect, or perfect: “chastity is distinguished into imperfect chastity, which contains itself from illicit pleasures of the flesh, and perfect chastity, which contains itself from all delectations of the flesh, even those licit in marriage”
Noldin n. 2In nearly the same words: Merkelbach II, n. 998
The Roman Catechism: a virtue of every state: “although the virtue of chastity shines with a brighter lustre in those who make the holy and religious vow of virginity, nevertheless it is a virtue which belongs also to those who lead a life of celibacy; or who, in the married state, preserve themselves pure and undefiled from unlawful desire”
The sacraments and prayer: “the most efficacious means for subduing its violence are frequent use of confession and Communion, as also unceasing and devout prayer to God, accompanied by fasting and almsdeeds”
Not only flight, but a whole life given to God: “Therefore there are negative parts, which ward off carnal stimuli, such as certain physical defects, sensual sights, filthy speech, vain loves; and positive parts, which truly affect man toward purity.”
Vermeersch n. 20In nearly the same words: Tanquerey n. 69
The Vices Opposed
Lust: “To chastity is opposed lust, which is an inordinate appetite and use of venereal things”
Wouters n. 444In nearly the same words: Tanquerey n. 12
Insensibility, by defect: “To chastity by defect is opposed insensibility, which declines the due use of venereal things; but by excess, lust, which is the inordinate appetite of venereal delight.”
Immodesty, against purity: “The acts of which there is question are not of themselves directly opposed to chastity, but to pudicity, which flees everything that excites shame and allures to lust.”