The most important second of our lives will be the second before we are judged on Judgement Day. Our memories will never be clearer than at that moment. We will remember everything bad that we have ever done, and we will be part of who judges us. If we will not feel comfortable in Heaven or paradise or whatever term we use for the next life, then we will condemn ourselves to our own punishment. However, there will be mercy as well as justice, mercy that will be granted because of the Atonement. We will also remember all the good that we did. Whenever we make a decision in this life, we should remember that second in the next. It will be the most important second in our lives.