You can always be successful when there is a desire to serve others.
At the end of each day, check if you have done anything for others. Also check if there is any consciousness of 'I' in all the things that you do for others. When there is even the slightest trace of a desire for benefit for yourself you cannot experience either contentment or success. Each day take up at least one thing that would bring benefit to others, irrespective of whether it will get you anything or not. When you serve with no selfishness you will find yourself succeeding in all you do.
~ Brahma Kumaris, Mt Abu.