'Own' in the Bible

That which was from the beginning, which we have listened to, which we have seen with our own eyes, and our own hands have handled concerning the Word of Life--

We are not to resemble Cain, who was a child of the Evil one and killed his own brother. And why did he kill him? Because his own actions were wicked and his brother's actions righteous.

He who believes in the Son of God has the testimony in his own heart: he who does not believe God has made Him a liar, in that he has refused to accept the testimony which God has given about His Son.