Human beings are like a tea bag because …

1. You’re kept in the dark for ages then suddenly dropped in it
2. Someone else is always holding the strings
3. You could be in hot water at any time 
4. At the end of the day you get chucked out and end up as compost

OR

You are like a tea bag because

1. You bring great taste to the world
2. You’re natural, simple and unassuming
3. People reach for you in times of need and crisis
4. You are ready to give people pleasure in just four minutes

Ok the last one is a bit dubious. But the message is clear -

Be more [positive] tea bag.