heraclito27 wrote:Hello, I have read that is good practice to give up passions like ill will and harmfulness. I have some questions about it.
What is ill will and harmfulness exactly? How do you know when ill will is in your mind?
What is the inmediate cause of ill will and how it can be extinguished?
Hello there and welcome to Dhamma Wheel

To put it simply, ill will is the desire to cause or wish harm upon another sentient being. It can manifest as just a thought or an action or words.
If you're hoping or causing harm upon another sentient being, you are acting out of ill will.
The cause of ill will is hatred, the second of the three unwholesome roots (the other two being greed and desire). Hatred stems from the desire to want things to be other than they are (selfishness) and the tendency to want to control things. It also stems from attachment to views and beliefs.
Ill will is eradicated through proper mindfulness, morality and renunciation. Proper mindfulness meaning paying attention to when thoughts of ill will arise and stopping them before they manifest into actions. Moral action is critical in eradicating the three unwholesome roots. It helps us to eliminate unwholesome actions, keeps regret at bay which aids in meditation practice, and helps us gain favor with our companions. And renunciation is the practice of letting go of desire and attachment - so not attaching to views, beliefs and wanting things (or people or actions) to be other than they are, but instead staying in the present moment and practicing some acceptance of reality.
Hope this helps
Dhammakid