Confine yourself to the present.
Vex not thy spirit at the course of things, they heed not thy vexations
The world is nothing but change, our life is only perception.
All things fade and quickly turn to myth.
Everything that happens, happens as it should.
Objective judgement, now, at this very moment. Unselfish action, now, at this very moment. Willing acceptance - now, at this very moment - of all external events. That's all you need.