D.t. Suzuki said this quote

Modern life seems to recede further and further away from nature, and closely connected with this fact we seem to be losing the feeling of reverence towards nature. It is probably inevitable when science and machinery, capitalism and materialism go hand in hand so far in a most remarkably successful manner. Mysticism, which is the life of religion in whatever sense we understand it, has come to be relegated altogether in the background. Without a certain amount of mysticism there is no appreciation for the feeling of reverence, and, along with it, for the spiritual significance of humility. Science and scientific technique have done a great deal for humanity; but as far as our spiritual welfare is concerned we have not made any advances over that attained by our forefathers. In fact we are suffering at present the worst kind of unrest all over the world.

~ D.t. Suzuki

The idea of Zen is to catch life as it flows. There is nothing extraordinary or mysterious about Zen. I raise my hand ; I take a book from the other side of the desk ; I hear the boys playing ball outside my window; I see the clouds blown away beyond the neighbouring wood: — in all these I am practising Zen, I am living Zen. No wordy discussions is necessary, nor any explanation. I do not know why — and there is no need of explaining, but when the sun rises the whole world dances with joy and everybody’s heart is filled with bliss. If Zen is at all conceivable, it must be taken hold of here.

~ D.t. Suzuki

To speak conventionally - and I think it is easier for the general reader to see Zen thus presented - there are unknown recesses in our minds which lie beyond the threshold of the relatively constructed consciousness. To designate them as “sub-conciousness” or “supra-consciousness” is not correct. The word “beyond” is used simply because it is a most convenient term to indicate their whereabouts. But as a matter of fact there is no “beyond”, no “underneath”, no “upon” in our consciousness. The mind is one indivisible whole and cannot be torn in pieces. The so-called terra incognita is the concession of Zen to our ordinary way of talking, because whatever field of consciousness that is known to us is generally filled with conceptual riffraff, and to get rid of them, which is absolutely necessary for maturing Zen experience, the Zen psychologist sometimes points to the presence of some inaccessible region in our minds. Though in actuality there is no such region apart from our everyday consciousness, we talk of it as generally more easily comprehensible by us.

~ D.t. Suzuki

When mountain-climbing is made too easy, the spiritual effect the mountain exercises vanishes into the air.

~ D.t. Suzuki