Desire Demands Its Own Attainment:
Most of the time, our desires are just habit so we must train ourselves to abandon these habits. When we have desires that are unattained, we become upset, and when we attain something we’ve tried to avoid, we become stressed. The Stoics teach to only avoid undesirable things that harm your mental, physical, and spiritual health that are within your control. If you avoid uncontrollable events like death, illness, or other similar misfortunes, you only suffer more than you need to. Be superior to your desires. If you desire something out of your control you only set yourself up for disappointment. That energy trying to get/avoid something out of your control can be put to much better use. Focus your desires only on what you can control and go about it with great prowess
Stick With Your Own Business:
Other people’s business does not concern you. Once you abolish all desires to know others’ business, you are immune to the persuasion of others. You are unable to be held back by the trivial accounts of others. You are free from their concerns and able to focus solely on your affairs. You can now approach life in the most effective manner. By not immersing yourself in others quarrels, you don’t hurt yourself or attain enemies.
Know What You Can Control and What You Can Not
You can achieve freedom and felicity once you realize this. The only things that you have direct control over are your thoughts, dreams, and opinion of events. Things that we cannot control are circumstances we are born into (such as Epictetus who was born into slavery), The anatomy you have, and your status among others. The common theme here is that you can control only what is internal, not external and controlled by the whims of others. Depression occurs when we obsess over externalities.