We know that nothing is guaranteed, that even the best laid and followed plans can be scuttled by any number of circumstances outside of our control.
But how do we give ourselves that best chance to find what we are all looking for in life?
I would suggest to you that your best chance lies in listening to the voice inside of you that has been there since your youngest moments, that has travelled with you throughout your life, and which will speak to you right up until the moment of your death and beyond.
God created you in His image and likeness. He gave you at least one special gift as well, many of us more than one. To some he has entrusted great intellect. To others great physical beauty. To some he instilled the ability to lead others. For some it is the gift of oratory, or art, or writing, or singing. Analytical abilities, mechanical abilities, technological proficiency.
In bestowing upon you whatever gift it is that He granted, there comes with it the responsibility to use that gift to make the world in which we live a better place for ourselves and our fellow man, to whatever extent we can achieve such a goal.