We should all invest in ourselves, but what that means can vary quite a bit.  Most people think that it means they should save for retirement.  Some think it means they should get a good education and continue learning all their lives.  Some think it means they should get a good job in a trade or profession they love.  All of those are worthy goals, but they are not really investing in yourself.
    The real you is not your material body which will end someday.  It is not your brain-mind which will essentially end when the body and brain end.  The part of you that is permanent and immortal is your spirit and soul.  Your light spirit and soul will survive your physical death, and even the end of planet Earth.  But what condition will it survive in?
    Since our souls are immortal, they cannot die, but in our materialistic world, most of our souls are so undernourished that they are in a state like a coma.  They are shriveled and dried up like prunes.  Like a hibernating frog that's been trapped in a wall for twenty years.  
    We need to invest in our spiritual future by awakening our souls, by nourishing them so they will become strong, healthy and alert and be able to communicate with us and with the Beings of Light in the spiritual worlds.  To do that, we need to feed them God's Grace or God's Light which come to us through the spiritual sun or the Sun or Righteousness .