He gets through too late who goes too fast

It goes away as fast as it comes.

Do not turn back when you are just at the goal.

Never thrust your own sickle into another's corn.

One ungrateful man does an injury to all who are suffering. [Lat., Ingratus unus miseris omnibus nocet.]

Union gives strength to the humble. [Lat., Auxilia humilia firma consensus facit.]