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Use "rationalness" in a sentence
"They who possess this faith, and cherish it as a priceless possession, may calmly oppose to the philosophic reasoning against the existence of  a Deity and the rationalness of entreating Him in prayer, the simple and sufficient declaration, "I believe.""
"In order to prove that they are not, and to have the means of judging hereafter of the rationalness of my present judgments, I will record the grounds of my despondency."
"Difficulties are kept out of view, and the beauty and rationalness of the ideal have all our thoughts."