James Grant (UNICEF Annual Report 1992):

“Family planning could bring more benefits to more people at less cost than any other single ‘technology’ now available to the human race.  But it is not appreciated widely enough that this would still be true even if there were no such thing as a population problem.”

Dr. Martin Luther King Jr, 1966:

"Unlike plagues of the dark ages or contemporary diseases (which) we do not yet understand, the modern plague of overpopulation is soluble by means we have discovered and with resources we possess. What is lacking is not sufficient knowledge of the solution, but universal consciousness of the gravity of the problem and the education of the billions who are its victims."

John Stuart Mill, 1848:

"If the earth must lose that great portion of its pleasantness which it owes to things that the unlimited increase of wealth and population would extirpate from it, for the mere purpose of enabling it to support a larger, but not a better or a happier population, I sincerely hope, for the sake of posterity, that they will be content to be stationary, long before necessity compels them to it."

The quote clearly links population with economics and resources; it distinguishes quantity ("larger") from quality ("happier") and fundamental human needs from assumptions about the need for growth.  Then:

"I cannot.....regard the stationary state of capital and wealth with the unaffected aversion so generally manifested toward it by political economists of the old school.  I am inclined to believe that it would be, on the whole, a very considerable improvement on our present condition. ....It is scarcely necessary to remark that a stationary condition of capital and population implies no stationary state of human improvement."

In his concepts of growth, Mill included population and wealth together.