'Chance' in the Bible

For this reason there is the more need for us to give attention to the things which have come to our ears, for fear that by chance we might be slipping away.

My brothers, take care that there is not by chance in any one of you an evil heart without belief, turning away from the living God:

For you know that later on, when he wanted [to regain title to] his inheritance of the blessing, he was rejected, for he found no opportunity for repentance [there was no way to repair what he had done, no chance to recall the choice he had made], even though he sought for it with [bitter] tears.

See that you give ear to his voice which comes to you. For if those whose ears were shut to the voice which came to them on earth did not go free from punishment, what chance have we of going free if we give no attention to him whose voice comes from heaven?