self-command

If you are upset, you will lack the self-command to hear opposing views, without which you cannot even stand wisely on your own.

When the King showed his speech to the Chancellor, that wise minister forgot for a moment his habitual self-command.

She was white and trembling; but she stood in that dignity which strong feeling, kept down by self-command, always imparts.

I have made a copy of the words you must use, lest your self-command should be too severely taxed.

No encouragement of applause, Dannie––just a long sigh in secret: then a grim age of self-command.

Her self-command was infinite, for she must have had a thousand questions to ask.