You know what is not invisible to the naked eye? DEATH is not invisible, and although you may feel invinsible surrounded by your youth as granted you for a short period of time on earth, soon you will become aware of who it is that you really are upon the earth, and what it all means, but by that time the damage in which you inflict will be cememented into your character by your own choosing, and you will have no one left to accuse or to blame but yourself in life. Then what? Will you ask for forgiveness maybe, cry out to the one you see as a boogey man in your life before you take your last breath ? I have seen bad people in their lives do this, do you think you are as strong as they thought they were ? One thing is for sure in life, and is an undisputable fact, you will die just like everyone else will, and let no man convince you otherwise, because if you do then you are a fool for sure...
Death doesn't scare me. I read Ecclesiastes 9

Whatever your hand finds to do, do it with all your might, for in the grave, where you are going, there is neither working nor planning nor knowledge nor wisdom.
Interp - What ever your hand finds to do (as long as it is good) do it with all your might, for once in the grave where you are going, there is neither working nor planning nor knowledge nor wisdom, in which you can anylonger give in teachings of to that which is still living upon the earth at this point, where as death has come into your life now, as the grave comes next for your body, but not for your soul.
To your brethren who are still living upon the earth as flesh and of bone, you are gone to them, and so are your works, as it refers not to where your spirit will be once it leaves your body and/or flesh, in which housed your spirit while walking upon the earth for all to bare witness to, but it refers to that which is no longer available to your brothers and sisters in which to bare witness to of your good (What ever your hand finds to do, do it with all your might) in which it has spoken of you to do while alive and walking upon the earth in witness of by men, and not after you have gone to the grave in which is to late for you to have done these good teachings (if passed on the opportunity) while alive by your own hands and should have been good works, in which the verse is therefore speaking of.