Your time, the hours you spend on this earth, is your most valuable asset. How you spend the hours you have been allotted in your life will determine the level of success you experience. You waste time when you spend it in unproductive endeavours, with unproductive people. The result of wasting your time quickly manifests in your life experience.
A better way to look at how to allocate your time is to speak in terms of investing your time, rather than spending it. To spend has a connotation of finality, with no return. When time is spent, it is gone for ever. When time is invested, there is a sense of return on the investment. For example, if you spend your time in college, you may or may not graduate. However, if you invest time in college, it seems to be a natural result that you graduate.
The law of value says: invest your time only in those people and those activities which are congruent with, or harmonic with your goals and vision. Choose to deal primarily with those people who are on a comparable level of consciousness with you. This is not to negate the value of charity with people who are less fortunate. The point is that you recognize it as charity work, and allocate your time and energy accordingly.
Ask yourself the time question, “What is the best use of my time right now?” Or, more precisely, “What is the best use of my time right now, taking into consideration my goals, vision and purpose?”

– The Twelve Universal Laws of Success