Contrast and one's power of mastering it indicate one's breadth of thought and especially the breadth of one's thinking in a particular creative attempt. Every writer should strive for the greatest possible breadth, for the greater his breadth the more people there are who will be interested in his work. Narrow minds interest a few people, and broad minds interest correspondingly many. The best way to cultivate breadth is to cultivate the use of contrast in your writing.
But to assume a breadth which one does not have, to pass from one extreme to another without perfect mastery of all that lies between, results in being ridiculous. It is like trying to extend the range of the voice too far. One desires a voice with the greatest possible range; but if in forcing the voice up one breaks into a falsetto, the effect is disastrous. So in seeking range of character expression one must be very careful not to break into a falsetto, while straining the true voice to its utmost in order to extend its range.
Let us now pass from the contrast of characters and situations of the most general kind to contrasts of a more particular sort. Let us consider the use of language first. Light conversation must not last too long or it becomes monotonous, as we all know. But if the writer can pass sometimes rapidly from tight conversation to serious narrative, both the light dialogue and the serious seem the more expressive for the contrast. The only thing to be considered is, can you do it with perfect ease and grace? If you cannot, better let it alone. Likewise, the long sentence may be used in one paragraph, and a fine contrast shown by using very short sentences in the next.
But let us distinguish between variety and contrast. The writer may pass from long sentences to short ones when the reader has tired of long ones, and _vice versa,_ he may pass from a tragic character to a comic one in order to rest the mind of the reader. In this there will be no very decided contrast. But when the two extremes are brought close together, are forced together perhaps, then we have an electric effect. To use contrast well requires great skill in the handling of language, for contrast means passing from one extreme to another in a very short space, and if this, passing is not done gracefully, the whole effect is spoiled.