What is the viewpoint of Islam toward self-defense?

What is the viewpoint of Islam toward self-defense? Is it a right? Are there conditions on that right? Does the Qur’an speak to the issue of self-defense?

Praise be to Allaah.Protecting oneself and one’s honour, mind, wealth and religion is a well-established basic principle in Islam. These are the five essentials which are well known to Muslims. A person has to defend himself; it is not permissible for him to consume that which will harm him, and it is not permissible for him to allow anyone to harm him. If a person or a vicious animal etc attacks him, he has to defend himself, or his family or his property, and if he is killed he is counted as a shaheed (martyr), and the killer will be in Hell. Read More
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