How does the conversion of an unbeliever take place?

QUESTION: How does the conversion of an unbeliever take place – instantly?

ANSWER: This question is truly immense. Multivolume books can be written about this, but they have already been written. How much evidence of conversion we find around us – and not only around us. Each believer can talk about his own conversion, although it is often such a personal experience that it lacks words or courage to describe it.