Arcana Coelestia #406
406. 'Lamech' means vastation, that is, the fact that faith is no more. This becomes clear from verses 23-24, below, which state that 'he killed a man (vir) to his wounding, and a little one to his bruising'. At that point 'man' is used to mean faith, 'a little one' or little child to mean charity.
John 15:16
16
You didn't choose me, but I chose you, and appointed you, that you should go and bear fruit, and that your fruit should remain; that whatever you will ask of the Father in my name, he may give it to you.