The Saints on "Satan"....pretty awesome

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"When the devil is called the god of this world, it's not because he made it, but because we serve him with our worldliness." (St. Thomas Aquinas, Doctor of the Church)

"Let not the heretic entrap you by bringing examples from the Scriptures. The devil makes use of the testimony of the Scriptures not to teach but to deceive." (St. Ambrose, Doctor of the Church, c.337-397 A.D.)

"It is a mark of the evil spirit to take on the appearance of an angel of light. He begins by whispering thoughts that are suited to a devout soul, and ends by suggesting his own." (St. Ignatius Loyola)

"The devil kisseth when he meaneth to kill; he giveth us a draught of poison in a golden cup, and in sumptuous and stately ship wafteth his passengers upon the rock of eternal ruin." (St. Robert Southwell)

"For because the traitorous angel fell, and was justly cast down from the honors he enjoyed, burning with envy he now endeavors to expel those whom God calls to heaven." (Vespers Hymn)

"He is called the enemy on account of the losses he inflicts on men; for the assaults of the Devil are made upon us, though their origin is not in his enmity towards us, but in his enmity towards God." (St. John Chrysostom, Doctor of the Church)

"Hence instead of cherishing resentment against our neighbor, we should turn our hatred and anger against Satan himself, by whom men are instigated to harm us." (Catechism of the Council of Trent)

"We always have two secretaries: the devil, who writes down our bad actions, to accuse us of them; and our good angel, who writes down our good ones, to justify us at the Day of Judgment." (Catechism of the Cure de Ars)

"Some say, 'I have done too much evil; the good God cannot pardon me:' My children, this is a great blasphemy; it is putting a limit to the mercy of God, which has no limit - it is infinite." (Catechism of the Cure de Ars)

"A good Christian watches continually, sword in hand, the devil can do nothing against him, for he resists him like a warrior in full armor; he does not fear him, because he has rejected from his heart all that is impure." (Catechism of the Cure de Ars)

"Among the absurd fallacies introduced by the demon into the world none is greater or more pernicious than the forgetfulness of the hour of death and what is to happen at the court of the rigorous Judge." (Ven. Mary of Agreda)

"Let the enemy rage at the gate, let him knock, let him push, let him cry, let him howl, let him do worse; we know for certain that he cannot enter save by the door of our consent." (St. Francis de Sales, Doctor of the Church)

"[Satan] is 'a murderer from the beginning', is also 'a liar and the father of lies' (Jn 8:44). By deceiving man he leads him to projects of sin and death, making them appear as goals and fruits of life." (Pope John Paul II, 1995)

"The strategy of our adversary can be compared to the tactics of a commander intent upon seizing and plundering a position he desires. The leader of an army will encamp, explore the fortifications and defenses of the fortress, and attack at the weakest point." (St. Ignatius Loyola)

"['(The devil) was a murderer from the beginning' (Jn. 8:44).] The devil did not go, girt with a sword, against man: he sowed an evil word, and slew him. Do not suppose therefore that you are not guilty of murder, when you suggest evil thoughts to your brother." (St. Augustine, Doctor of the Church)

"Believe me, Brethren, Satan dreads the watchings of holy men, and their prayers, and fasts, and voluntary poverty, and works of mercy, and humility, and above all, their ardent love for Christ our Lord, at the mere sign of whose most holy Cross he is disabled and put to flight." (St. Antony)

"All those who love the Mother of God, that is to say, all true Catholics, are persuaded that, after God, Mary is our principal support in our conflicts with Satan. This persuasion is not merely a pious conjecture; it rests on constant experience and on dogmatical foundations the most unshaken." (Fr. Delaporte)

"For however great the power and pertinacity of Satan, he cannot, in his deadly hatred of our race, tempt or torment us as much, or as long as he pleases; but all his power is governed by the control and permission of God." (Catechism of the Council of Trent)

"Whoever, then, purposes to enlist, under the standard of Christ, must first of all, enter into a sacred and solemn engagement to renounce the devil and the world, and always to hold them in utter detestation as his worst enemies." (Catechism of the Council of Trent)

"The devil has never made anyone or begotten anyone or created anyone; but whoever acts as the devil does becomes in one sense a child of the devil, as if begotten by him. The child resembles the father, not because they are literally kin, but because the child imitates the father." (St. Augustine, Doctor of the Church)

"The basic, universally accepted subdivision of satanic activity is the following: the demon operates an ordinary activity, temptation, and an extraordinary activity, which includes the entire range of evil disturbances, of various degrees of seriousness and nature." (Gabriele Amorth, Chief Exorcist of Rome)

"We must avoid addressing the demon directly to find out his name and - I add - anything else. All other considerations aside, a direct dialogue with the demon can be dangerous to anyone who dares to initiate it without the due authorization of the Church, and therefore without her protection." (Gabriele Amorth, Chief Exorcist of Rome)

"And while in times past demons, occupying springs or rivers or trees or stones, cheated men by deceptive appearances and imposed upon the credulous by their juggleries, now, after the divine coming of the word, an end is put to their deceptions. For by the sign of the cross, a man but using it, their wiles are put to flight." (St. Athanasius, Doctor of the Church, c. 318 A.D.)