A man cannot have a better guide than himself, nor any physic better than a regular life. - Luigi Cornaro

It is universally agreed, that custom, in time, becomes a second nature, forcing men to use that, whether good or bad, to which they have been habituated; in fact, we see habit, in many instances, gain the ascendency over reason. This is so undeniably true, that, virtuous men, by keeping company with wicked, often fall into the same vicious course of life. Seeing and considering all this, I have decided to write on the vice of intemperance, in eating and drinking. Now, though all are agreed, that intemperance is the parent of gluttony, and sober living the offspring of abstemiousness, yet, owing to the power of custom, the former is considered a virtue, and the latter as mean and avaricious, and so many men are blinded and besotted to such a degree, that they come to the age of forty or fifty, burdened with strange and painful infirmities, which render them decrepit and useless, whereas, had they lived temperately and soberly, they would in all probability, have been sound and hearty, to the age of eighty and upwards.

No man should be a perfect physician to any but himself.

It is true, and cannot be denied, that man must at last die, however careful with himself he may have been; but yet, I maintain, without sickness and great pain, for in my case I expect to pass away quietly and peacefully, and my present condition ensures this to me, for, though at this great age, I am hearty and content, eating with a good appetite, and sleeping soundly. Moreover, all my senses are as good as ever, and in the highest perfection; my understanding clear and bright, my judgment sound, my memory tenacious, my spirits good, and my voice (one of the first things which is apt to fail us) has grown so strong and sonorous, that I cannot help chanting aloud my prayers, morning and night.