The right moment
You might be waiting for things to settle down. For the kids to be old enough, for work to calm down, for the economy to recover, for the weather to cooperate, for your bad back to let up just a little...
The thing is, people who make a difference never wait for just the right time. They know that it will never arrive.
Instead, they make their ruckus when they are short of sleep, out of money, hungry, in the middle of a domestic mess and during a blizzard. Whenever.
As long as whenever is now.