What does the Bible say about being called by God?

In John 11, we see that the call of God is twofold: an outward call, which is the general preaching of the gospel, and an effectual call, which is the irresistible work of the Holy Spirit that draws a sinner to Christ. Martha's message to Mary illustrates this effectual call, as she tells Mary, 'The Master is come, and calleth for thee' (John 11:28). The effectual call always results in an immediate response, as seen when Mary arose quickly and came to Jesus after she heard His call. This reflects God's sovereignty in salvation, illuminating the hearts of the called to respond in faith.