This phrase keeps coming to my mind. Whatever it is growth, learning or leadership, we often need to have the courage to face the unknown, a life without any assurances.
By unknown I mean that something that is unknown to us. Meaning we do not have personally experience with that. If we do not personally experience something we cannot really know what is anything like, no matter how hard we try.
Try simulating weightlessness (microgravity) for example? In a pool we might get pretty close, yet that is pretty far away from the actual experience.
Only way really to know is to see ourselves, to experience by ourselves. Only by getting to know the unknown for as long as we live, we can have more accurate sense of reality. We need to go towards the unknown to know what life has in for us.