at a point you've asked too much of human beings and it's not intelligent to keep going.

There is not an imminent threat to human beings. There is not an imminent threat to the U.S. in any way.

Most human beings are quite likeable if you do not see too much of them.

Men are not human beings,they are human doings

There is not an imminent threat to human beings.

When it comes to the pinch, human beings are heroic.