I know this may sound trite but in the end it comes down to our personal relationship to God. Each of us must examine ourselves to see if we're in the faith-the Bible is specific on evidence of our salvation.
Personally for me the bottom line is knowing and understanding what God has done in my life. Unfortunately it is impossible for me to share these personal miracles. They are either dismissed by others as rubbish or casted aside in disbelief mainly because it is my personal experience. But, I believe these personal and intimate relationship between the believer and our Lord Jesus is as God intended.
If one looks inside their heart and and can point to no miracles that God has performed for them they are empty tombs. They should seriously question whether they're in the faith. The greatest miracle is how God changes us and if one cannot point to God's changes in their life then they need to ask to see them. In the end it is a personal relationship between God and you and only YOU know what that is.
SD