How you are fallen from heaven,
O Lucifer, son of the morning!
How you are cut down to the ground,
You who weakened the nations!
Isaiah 14:12
Satan defiled her (weakened her) when he initiated a conversation with her and she began to dialog with him instead of doing what Jesus did and speaking the word of God.
Keep your heart with all diligence,
For out of it spring the issues of life.
Proverbs 4:23
If we have the Spirit of God in our heart then we can impart grace to those who hear us.
If we are defiled with evil things then we will defile others as we engage in communication which is communion (common union) or fellowship.
And have no fellowship with the unfruitful works of darkness, but rather expose them. Ephesians 5:11
But now I have written to you not to keep company with anyone named a brother, who is sexually immoral, or covetous, or an idolater, or a reviler, or a drunkard, or an extortioner—not even to eat with such a person. 1 Corinthians 5:11
Do not be unequally yoked together with unbelievers. For what fellowship has righteousness with lawlessness? And what communion has light with darkness? And what accord has Christ with Belial? Or what part has a believer with an unbeliever?
2 Corinthians 6:14-15
Jesus warned us about becoming defiled by those who are themselves defiled with all manner of evil.
So He said to them, “Are you thus without understanding also? Do you not perceive that whatever enters a man from outside cannot defile him, because it does not enter his heart but his stomach, and is eliminated, thus purifying all foods?” And He said, “What comes out of a man, that defiles a man. For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders, thefts, covetousness, wickedness, deceit, lewdness, an evil eye, blasphemy, pride, foolishness. All these evil things come from within and defile a man.” Mark 7:1-23
JLB