My forefathers were expelled from our lands in the first century AD, and returned just about a century ago. Over 1800 years in exile. During all that time, every generation longed to return, and 1800 times we as a nation prayed for return.

We did it. It took almost two millennia, but we kept our goals and we kept our customs and we kept our values.

Perhaps a similar social structure will help humans inhabit other star systems on generational ships.