Usar "practicableness" en una oración

1. The first misconception about the impracticableness of the teaching consists in this, that the men of the social comprehension of life, being unable to comprehend the method by means of which the Christian teaching guides men, and taking the Christian indications of perfection to be rules which determine life, think and say that it is impossible to follow Christ's teaching, because a complete fulfilment of this teaching destroys life