To live happily comes from an inner power of the soul. This happens when you feel indifferent toward things that don't really matter. To feel this way, you must look at all worldly things — both the parts and the whole. Remember that no outside thing can create an opinion in your mind by itself. These things can't force their way into your thoughts. They just sit there, still and quiet. We create our own opinions about them. We print these thoughts in our minds ourselves. We have the power not to print them at all. And if some opinions do sneak in and hide, we have the power to wipe them away.
To live happily is an inward power of the soul, when she is affected with indifferency, towards those things that are by their nature indifferent. To be thus affected she must consider all worldly objects both divided and whole: remembering withal that no object can of itself beget any opinion in us, neither can come to us, but stands without still and quiet; but that we ourselves beget, and as it were print in ourselves opinions concerning them. Now it is in our power, not to print them; and if they creep in and lurk in some corner, it is in our power to wipe them off.