Hippocrates Praeceptiones 8

[8] So much for such recommendations. For remission and aggravation of a disease require respectively less or more medical assistance. A physician does not violate etiquette even if, being in difficulties on occasion over a patient and in the dark through inexperience, he should urge the calling in of others, in order to learn by consultation the truth about the case, and in order that there may be fellow-workers to afford abundant help. For when a diseased condition is stubborn and the evil grows, in the perplexity of the moment most things go wrong. So on such occasions one must be bold. ¹ For never will I lay it down that the art has been condemned in this matter. ² Physicians who meet in consultation must never quarrel, or jeer at one another. For I will assert upon oath, a physician’s reasoning should never be jealous of another. To be so will be a sign of weakness. Those who act thus lightly are rather those connected with the business of the market-place. Yet it is no mistaken idea to call in a consultant. For in all abundance there is lack. ³