Yusef reminds us how important it is to observe our own frequency. He tells us that we actually attract others who are vibrating at a similar frequency. We are somewhat like magnets that way.
So what do frequencies look like? The “higher” frequencies look like love, acceptance, no judgment of self or others, compassion, peace, joy, etc. The “lower” frequencies look like frustration, anger, blame, shame, impatience, judgment of self and others, etc. We have only to look at our friends and those around us to be able to gauge where we are on the continuum. They will “mirror” our own frequency. 
Yusef includes a caution: When a person who is vibrating at a higher frequency (i.e. love and acceptance) spends time with someone who is at a lower frequency (i.e. angry or judgmental), then their own frequency is somewhat diminished. It’s best not to spend too much time around those who may diminish our own frequencies. We’re told to be aware and to “re-energize” through prayer, spiritual exercise, or just by being in the presence of those who also vibrate to the frequency of love and acceptance. Then that love is amplified and blesses the Earth and the Heavens.
YUSEF:
Like frequencies gather together. There is an attraction there. Begin to notice the frequencies around you. When you are in the presence of others of like frequency there is an amplification that travels beyond the occupied space. Others who also exist at that frequency are “strummed” by your vibration, accept the “push”, and pass it on. Thus do frequencies interact.
When a person is vibrating at a higher frequency, but is surrounded by those vibrating at a lower frequency, that higher vibrational impetus is absorbed by the slower ones and is somewhat diluted. That is, its energy is lost [diminished] and lost momentum not only affects those around it, but returns to the sender in a slower vibrational field—affecting the sending higher vibrational source.
That diminishing must not be allowed for long periods of time. Rejuvenating, “re-energizing” must take place through direct meditation contact [with God], or contact with others of similar frequency that synergistically raise the vibrations of all reciprocally.
This message reflects my personal experiences; peaceful people have such a calming influence on others.
Barbara,
This one is tough. When someone has to work in an environment like I do that interacts with low vibrations daily, it is hard to keep my vibrations up. I have a tug at me to keep spreading my positiveness though. I feel that many of these people have lost their way. They need reminding that they do not have to live each day angry and defensive. If I or others can help them to see another way of looking at life then their energy can vibrate at a higher frequency helping others too. I know this is a tough task sometimes and I find myself diminished frequently; however, I am not ready to give up my job just to make it easier on myself……maybe I should though. Last year, I almost wanted to go somewhere else.
Your experience, Pam, is probably very common so you speak for many. But I think its important for all of us to heed Yusef when he says to find time to meditate, pray, do your own spiritual practice, and/or spend some time with folks who can “lift us up” rather than drag us down. Then you can do what you are feeling called to do and bring your positive attitude into the workplace. It is difficult to know the issues some people live with, but all benefit from the higher vibrations.