You must have a mission statement in life.
This is simply a set of guiding principles which clearly state where you are going and where you want to be at the end of your life.
A mission statement embodies your values.
It is your personal lighthouse keeping you steadily on the course of your dreams.
Over a period of one month, set a few hours aside to write down five or ten principles which will govern your life and which will keep you focused at all times.
Examples might be to consistently serve others, to be a considerate citizen, to become highly wealthy or to serve as a power full leader.
Whatever the mission statement of your life, refine it and review it regularly.
Then when something adverse happens or someone tries to pull you off course, you quickly and precisely return to your chosen path with the full knowledge that you are moving in the direction that you have selected.