A passage from Epictetus
Epictetus, Discourses IV.13
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When you are going to undertake any action, remind yourself what kind of action it is. If you are going to bathe, represent to yourself the usual incidents of the bath: some persons splash, some push, some use abusive language, others steal. And thus you will more securely go about it, if you say, 'I will bathe, and I will keep my mind conformable to nature.'
Related passages
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Begin the morning by saying to thyself, I shall meet with the busy-body, the ungrateful, arrogant, deceitful, envious, unsocial.
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Take away thy opinion, and then there is taken away the complaint, 'I have been harmed.' Take away the complaint, and the harm is taken away.
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If you are distressed by anything external, the pain is not due to the thing itself, but to your estimate of it; and this you have the power to revoke at any moment.