Genesis 1:3-5

 'And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day. And God said, Let there be light: and there was light. And God saw the light, that it was good: and God divided the light from the darkness. ' Genesis 1:3-5 https://my.bible.com/bible/1/GEN.1.3-5
Light will always win over darkness. If you take the weakest match and light it on the darkestnight, the light will shine!
Let your light so shine before men, that they may see your good works, and glorify your Father which is in heaven. Matthew 5:16 KJV https://my.bible.com/bible/1/MAT.5.16.KJV
You can be a witness to others if you are saved. I know many will say, I am not trained.Here is the basic training. What has Jesus done for you? How did you get saved?Tell other people about that! You would be surprised what God will do with that!
I have heard it said that witnessing is similar to grandparents telling about their grandchildren. I am now that person! Let me tell you about my grandson! Let me tell you about my Jesus!
If you don't know Him, take this test and see if you are good enough on your ownto go to heaven when you die.

http://www.goodpersontest.com/