Little drops of water, little grains of sand, make the mighty ocean and the pleasant land. Too many cooks spoil the broth. Wald nicht sehen. Can't see the forest for the trees. Vorsicht ist die Mutter der Porzellankiste.
Caution is the mother of the porcellain chest.
Was Du heute kannst besorgen, verschiebe nicht auf morgen. Don't put off till tomorrow, what you can do today. Do unto others as you would have them do unto you. Was ich nicht weiss, macht mir nicht heiss. What you don't know won't hurt you.