The strongest guard is placed at the gateway to nothing. Maybe because the condition of emptiness is too shameful to be divulged.
Explanation separates us from astonishment, which is the only gateway to the incomprehensible.
Immigration is a gateway basically. It's a check-off point for Latino voters.
Rapture is the gateway to nirvana.
Faith is a gateway to happiness that remains permanently accessible to each of us, wherever we are, no matter our circumstances.