Take a look at:
Luke 13:3 (NKJV) I tell you, no; but unless you repent you will all likewise perish.
This verse says we will perish or be lost unless we do what?
(Repent means to change the heart or mind which leads to a change of life.)
Now Read:
Acts 17:30 (NKJV) Truly, these times of ignorance God overlooked, but now commands all men everywhere to repent
This verse tells us God commands all people everywhere to do what?
Is ignorance of God's law an acceptable excuse?
Read the following verse:
II Corinthians 7:10 (NKJV) For godly sorrow produces repentance leading to salvation, not to be regretted; but the sorrow of the world produces death
What does godly sorrow work in us? (We will never change or repent until we truly feel sorrow for our sins.)
What does godly sorrow work in us? (We will never change or repent until we truly feel sorrow for our sins.)
