God is always calling us. We are all given a conscience, and we need to have a clear conscience to hear his calls. The voice of the Lord is ever so gentle that a soul in turmoil won't be able to hear it. To have some time to turn to God is absolutely crucial to hearing him. Living a busy life, you can easily not hear the Lord your whole life and miss all the golden opportunities to reconcile yourself to him. This would indeed be a great tragedy.