I found this bit of wisdom in The Public from early 1917:
In the establishment of justice, hot-heads are dangerous. The building of a higher civilization will come through the efforts of warm hearts and cool heads --- not cold hearts and warm heads.
Laurie J. Quinby
Today, it seems as if we have few of the warm hearts and cool heads to choose from -- and the "cold hearts, warm heads" don't seem willing to consider the need for them.