How are we to know that the mind has become concentrated? Because the idea of time will vanish. The more time passes un-noticed the more concentrated… - Ram Dass

You'll lose it, you'll come down, but that's okay. Don't knock it. Because the grace to experience the possibility of yourself keeps helping you aim and redirect — and as you learn how to do it, every time you start to come down — the things that bring you down are your own clinging, fears, unworthiness, self-pity, stuff like that. And you just start to ‘here ma you take it, here Ram Dass you take it, you take my stuff, I don't need it anymore.’

And everything that interferes with your tuning to God within yourself, you just start to let it go. No big deal about it, you just start to let it go.

Who I am is awareness and deep love, a presence beyond experience within a temporal, changing form. Who I am is a soul, a soul without a name, address, social security number, or biography, who isn't born and doesn't die. I am.

Your problem is you are too busy holding on to your unworthiness.