No problem can be solved until it is reduced to some simple form. The changing of a vague difficulty into a specific, concrete form is a very essential element in thinking. J. P. Morgan
On the basis of the familiar experience that that which is learned with difficulty is better retained, it would have been safe to prophesy such an effect from the greater number of repetitions. Hermann Ebbinghaus
One would think that in writing about literary men and matters there would be no difficulty in finding a title for one's essay, or that any embarrassment which might arise would be from excess of material. I find this, however, far from being the case. James Payn
Owing to the difficulty of dealing with substances of high molecular weight we are still a long way from having determined the chemical characteristics and the constitution of proteins, which are regarded as the principal con-stituents of living organisms. Karl Landsteiner
Owing to the difficulty of obtaining horses, Mr. Henry returns from this place. In descending the Mississippi I will request him to pay his respects to you. Zebulon Pike
She complains of difficulty breathing satisfactorily at times, and of heavy, lethargic sleep, with dreams that frighten her, but regarding which she can remember nothing.
Should he really call for help though, even apart from the fact that all the doors were locked? Despite all the difficulty he was in, he could not suppress a smile at this thought.
So where are you going, in to the office? Yes? Will you report everything accurately, then? It's quite possible for someone to be temporarily unable to work, but that's just the right time to remember what's been achieved in the past and consider that later on, once the difficulty has been removed, he will certainly work with all the more diligence and concentration.
Some people carry their hearts in their heads; very many carry their heads in their hearts. The difficulty is to keep them apart, yet both actively working together. Augustus Hare
Somebody who was born in this country who visited China would later face difficulty getting back in to the USA. We have to keep in mind that the struggles of the Chinese against these exclusion laws really laid down the foundations of civil rights law. Iris Chang
