A representative collection:

Matter is revealed to us only in consciousness; it cannot therefore be the cause or the principle of consciousness
Immanuel Kant

Criticism alone can sever the root of materialism, fatalism, atheism, free-thinking, fanaticism, and superstition, which can be injurious universally;
Immanuel Kant

No town can live peacefully, whatever its laws, when its citizens … do nothing but feast and drink and tire themselves out in the cares of love.
Plato

Materialism coarsens and petrifies everything ; makes everything vulgar and every truth false.
H.F.Amiel

Materialism means simply the denial that the moral order is eternal, and the cutting off of ultimate hopes; spiritualism means the affirmation of an eternal moral order and the letting loose of hope.
William James

When we try in good faith to believe in materialism, in the exclusive reality of the physical, we are asking our selves to step aside; we are disavowing the very realm where we exist and where all things precious are kept—the realm of emotion and conscience, of memory and intention and sensation.
John Updike

Scientific materialism has merely introduced a new hypostasis, and that is an intellectual sin. It has given another name to the supreme principle of reality and has assumed that this created a new thing and destroyed an old thing. Whether you call the principle of existence “God,” “matter,” “energy,” or anything else you like, you have created nothing; you have merely changed a symbol. The materialist is a metaphysician malgré lui
Carl Jung

With regard to this question modern physics takes a definite stand against the materialism of Democritus and for Plato and the Pythagoreans. The elementary particles are certainly not eternal and indestructible units of matter, they can actually be transformed into each other.
Werner Heisenberg

You need an ideology in order to exist.
Bernanke (2010)

We must have an ideology. The other side have got an ideology they can test their policies against. We must have one as well.
Margaret Thatcher

I do not deny the existence of material substance merely because I have no notion of it, but because the notion of it is inconsistent, or in other words, because it is repugnant that there should be a notion of it.
George Berkeley

Religion makes us want to live;
Religion makes it easier to be decent;
Religion gives us a sense of purpose and meaning.
Oliver Thomas

[War's] "horrors" are a cheap price to pay for rescue from the only alternative supposed, of a world of clerks and teachers, of co-education and zoophily, of "consumer leagues" and "associated charities," of industrialism unlimited, and feminism unabashed. No scorn, no hardness, no valor any more! Fie upon such a cattleyard of a planet!
William James

I do not have to paint how dismal such a view of the world is.
Rudolf Steiner

[Peace is] a dream and not a pleasant one at that; without war, the world would wallow in materialism.
Helmuth von Moltke

The mind precedes all things, the mind dominates all things, the mind creates all things.
Buddha

For that some should rule and others be ruled is not only essential, but beneficial, and at the point of birth people are divided into those to be ruled and those who rule.
Aristotle

A matter of definition:

In philosophy

A few more

The pathetic materialist

Mental destitution

A view of hardcore platonists

Keyboard

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Objections against materialism

Believers have always detested materialists and relentlessly persecuted them. Even now, the materialist opinion is generally distrusted. Why? Let's look at some objections, not about faith in supernatural entities but on practical things like affections, ethics, and methods.

A serious objection voiced by adversaries is that materialism kills the beauty in life and denies the spirit that distinguishes humans from animals. It allegedly rejects love, poetry, creativity, spirituality and the arts and replaces them by hard and joyless banality. Marvellous works of art could only have been made during religious ecstasy: cathedrals, frescos, paintings, and chorals, are the result of faith. Music like the Hohe Messe and the Art of the Fugue by Bach could not have been written by an infidel. Our culture and our ideas are part of us. To reject them, which is what the materialists propose, would violate our nature. Another one: the medieval flourishing of arab culture was caused by islam, but the barrenness that followed was not. However such assertions present no evidence that shows that belief in a transcendental being or some other idol helps creating works of art or scientific laws that would not have been possible without ideological constraints. Great works of art and science clearly have been produced despite the restrictions imposed by a belief in some idol or doctrine. Strong hierarchies usually do not stimulate but obstruct innovation in knowledge and art. Ideology tends to be incompatible with art and science as recently shown by the soviets, the fascists, and the Chinese communists. The beauty in religious art is not what is religious in it but what is beautiful. The opinion that love of art is anti-materialistic is too weird to contradict; anyone interested in this has by now found out that emotions are effects of the limbic brain and created by the cerebrum.

Hobbes disapproved of liberty and denied equality (which are materialist values) because social stability requires a strong hierarchy; that means that idealism and a feodal organization are vital to prevent run-away anarchy and arbitrary tyranny. This is also the argument that the Chinese government uses to defend its censorship (and the detention of Ai Wei Wei). Materialists reject that solution for stability because what causes social problems cannot be used as a remedy for them. Unsurprisingly, ideots who tried that made matters worse.

Some other objections:

Countering these objections is left as an exercise for the reader. Sources and links that can be found all over the EpistYlion site may help. A Google search shows however that materialism is usually understood in the second sense (consumerism) while idealism is supposed to mean love for an ideal. Words, really...