Don't let thoughts about how miserable life can be disturb you. Don't let your mind wander and pile up all the troubles and disasters that might happen to you. Instead, when something specific bothers you, ask yourself: What exactly makes this present situation so unbearable? You'll be embarrassed to admit it. Then remember that the future can't hurt you, and neither can the past. Only the present moment can hurt you. And even that pain shrinks when you focus just on this one small moment. Then ask your mind: if it's only for this brief instant, can't you bear it with patience?
Let not the general representation unto thyself of the wretchedness of this our mortal life, trouble thee. Let not thy mind wander up and down, and heap together in her thoughts the many troubles and grievous calamities which thou art as subject unto as any other. But as everything in particular doth happen, put this question unto thyself, and say: What is it that in this present matter, seems unto thee so intolerable? For thou wilt be ashamed to confess it. Then upon this presently call to mind, that neither that which is future, nor that which is past can hurt thee; but that only which is present. (And that also is much lessened, if thou dost lightly circumscribe it:) and then check thy mind if for so little a while, (a mere instant), it cannot hold out with patience.