Where do such incentives to do evil come from?

The Fathers liken the human heart to the “promised land” in which the Philistines, Babylonians, and other nations cast spears and arrows, namely bad exhortations. These “devilish”, “carnal”, “impure” thoughts cannot come from our hearts because it was created by God.
So, they come “from the outside”. They don’t belong to our natural way of thinking. And as long as they stay “outside” us, they are not sinning. They become evil only when we consciously and voluntarily accept them when we identify with them. But the Gospel says that evil comes from the heart, not things (Mt 15:19)
Sure, but we have to be careful how we explain the text. Sin comes from the heart of a man because consent to evil is given within man, his free will. Bad thoughts and passionate desires almost always revolve around us. It often fills our imagination and our minds. It constitutes a human weakness after the sin of our ancestors. But they are not a real evil in themselves. The Church claims that lust comes from sin and lures to sin, but it is not a sin in itself. And so, we live in a dangerous state, still exposed to temptation. ..
How to purify your heart?
Man’s life on earth is a struggle, says Job (7: 1). One proverb adds: Whoever does not want to fight, should not even live. But we must not exaggerate the difficulties of this struggle. The ancient mystical author, Pseudo—Marius, likens our souls to a big city. It is beautiful in the middle of a castle, next to it is a marketplace and then there is a periphery. The enemy, the inherited sin, occupied the periphery, namely our senses. And that’s why we are often worried there. But these riots often permeate the marketplace, that is, where the debate begins, whether we should accept the idea as our own or rather reject it. But into the castle of the interior, where our freedom is the master, sin cannot penetrate unless we open the gate to it with his free consent.
St. Theresa of Avila also speaks of the “castle of the interior” of our
souls where we can talk to our Lord, the divine Guest, without any interference from the outside. Despite this, we are internally divided. It’s not pleasant at all, it’s downright tiring … Spiritual people do not just try to avoid sin, but also to purify the heart because that is the only way the soul can return to the inner room. Monk authors call austerities by the Greek term praxis and thus denote spiritual application (practice). However, they distinguish between “external
practice “- which focuses on avoiding sinful deeds – and” inner practice “aimed at purifying the heart. Usually presented moral lessons, unfortunately, they remain limited to external practice: “This must not be done, this can be done.” And perhaps this can explain why some people are so often upset and don’t know what to do when they apply known external laws do not help, and in search, other solutions resort to various methods, which offers false mysticism, doctors, and drugs. It is often forgotten that Christian spirituality offers very effective instructions on how to get a room.
Where can I find these instructions?
Monks who chose to live in solitude, in particular well versed in how to acquire an inner room. They sought peace by escaping from the world. But very soon they experienced that mere solitude alone does not bring peace. Holy, For example, the abbot Antonio took refuge in the desert, but he was attacked by “demons”, many thoughts and ideas that worried him. So he had to teach these “demons” to overcome. Only after a long inner struggle did he learn how to overcome ideas.
Only then did his loneliness become a place of peace. This experience was so general, so well known, that the state law of the Byzantine Empire forbade monks.
How to purify your heart?
To take refuge in the desert without first living ten years of ascetic life in a monastery. Monks, so they first had to learn to control their thoughts and their ideas before they could indulge in hermit life. These experiences of ancient monks are still for the present human accessible and useful? It is interesting that they are being translated at the moment and publish texts of ancient spirituality on the internal struggle, Just because they feel they are needed and growing up demand them. To give a well-known example, it is enough to recall how translations have multiplied recently Philokalia by Nicodemus Hagiority. The text is a collection of numerous patristic passages in which they learn how to achieve purity of heart, which is a condition of good prayer. And the living room. It has been said that sin will only occur if one gives free consent, which is combined with a bad idea. But how can we know for sure whether we freely agreed or not? During confession, some scrupulous people that they “had bad thoughts,” but they can’t answer whether they agreed with them or not the monks knew that such uncertainty greatly harmed peace of mind. Therefore, they proposed a thorough analysis of the thought process that occurs in the internal temptations. There are usually five periods of penetration of evil into the heart: 1. guidance, 2. conversation, 3rd fight, 4th consent, 5th passion. That certainly requires your ventilation.