One has to draw the line somewhere

One has to draw the line somewhere.

Prov. It is necessary to set limits and enforce them. Ellen: This is the fifth night this week that my son has stayed out too late. Jane: Why not punish him, then? You have to draw the line somewhere. I am a fairly easygoing employer, but I cannot allow my employees to take two hours for lunch. I have to draw the line somewhere.
See also: draw, line, one, somewhere