This past Sunday I preached from Luke 13:1-9. Verses 3 and 5 both say

“No I tell you, unless you repent you will all likewise perish.”

You can listen to the whole sermon here.

Here is an excellent quote from J.C. Ryle on the nature of true repentance:

“The nature of true repentance is clearly and unmistakably laid down in holy Scripture. It begins with knowledge of sin. It goes on to work sorrow for sin. It leads to confession of sin before God. It shows itself before man by a thorough breaking off from sin. It results in producing a habit of deep hatred for all sin. Above all, it is inseparably connected with lively faith in the Lord Jesus Christ. Repentance like this is the characteristic of all true Christians.”