The Encheiridion, or Manual (21-23)

Let death and exile and every other thing which appears dreadful be daily before your eyes; but most of all death: and you will never think of any thing mean nor will you desire any thing extravagantly.

If you desire philosophy, prepare yourself from the beginning to be ridiculed, to expect that many will sneer at you, and say, He has all at once returned to us as a philosopher; and whence does he get this supercilious look for us? Do you not show a supercilious look; but hold on to the things which seem to you best as one appointed by God to this station. And remember that if you abide in the same principles, these men who first ridiculed will afterwards admire you: but if you shall have been overpowered by them, you will bring on yourself double ridicule.

If it should ever happen to you to be turned to externals in order to please some person, you must know that you have lost your purpose in life.[*] Be satisfied then in every thing with being a philosopher; and if you wish to seem also to any person to be a philosopher, appear so to yourself, and you will be able to do this.