Institutio Oratoria

But to possess this gift, our orator will require all the resources of nature, learning and industrious study. Therefore let no man hope that he can acquire eloquence merely by the labour of others. He must burn the midnight oil, persevere to the end and grow pale with study: he must form his own powers, his own experience, his own methods: he must not require to hunt for his weapons, but must have them ready for immediate use, as though they were born with him and not derived from the instruction of others.

The road may be pointed out, but our speed must be our own. Art has done enough in publishing the resources of eloquence, it is for us to know how to use them.