Here's the link:
But let's start with the very first quote on City Planning by Horace Bushnell:
Considering the immense importance of a right location, and a right planning for cities, no step should ever be taken by the parties concerned, without employing some person who is qualifies by a special culture, to assist and direct. Our engineers are trained for a very different kind of service, and are partially disqualified for this by the habit of a study more strictly linear, more rigidly scientific, and less artistic. The qualifications of surveyors are commonly more meagre still...Nothing is more to be regretted, in this view, than that the American nation, having a new world to make, and clean map on which to place it, should be sacrificing their advantage so cheaply, in the extempore planning of towns and cities. The peoples of the old world have their cities built for times gone by, when railroads and gunpowder were unknown. We can have cities for the new age that has come, adopted to its better conditions and ornament. So great an advantage ought not to be thrown away. We want, therefore, a city planning profession..."
"City Plans" 1864
So check out the quotes from the link above and leave a comment about your favorite planning quote.