The great questions of the day will not be settled by means of speeches and majority decisions but by iron and blood.

Blood and iron.

You see things; and you say, "Why"; But I dream things that never were; and I say, "Why not?"

No question is so difficult to answer as that to which the answer is obvious.

[The great questions of the day] are not decided by speeches and majority votes, but by blood and iron.

When a man says he approves of something in principle, it means he hasn't the slightest intention of carrying it out in practice.