Here is a link to scans of Creative Illustration by Andrew Loomis, 1947.
From the closing chat:
Let us as artists, then, feel that we have a trust. Let us be sincere, if for no other reason than to give our craft character. Let us choose to reproduce beauty rather than the sordid, if only to elevate the standards of beauty. If we seek an audience to our way of expression, let us make the things we have to say worth while. When we have a choice, let us build, not tear down. If we are endowed with the vision to encompass beauty, let us be grateful, but not selfish about it. To live and work only to please one's self, using art as a means of display for uncontrolled temperment and undisciplined license, for divorcing oneself from the normal and ethical standards of life, to my mind is wrong. Art belongs to life, and essentially to the common, everyday man.