Text messages are powerful things.
While being deceptively innocent, only a collection of letters strung together and sent to one another through a satellite, they can shake people's world.
A text message late at night could cause fear and worry.
Hand over the evidence or Sherlock is a dead man.
It could unleash frustration and irritation.
Johnny! Could you lend me some money possibly? HW
It could produce the strange pair of annoyance and fondness.
Hurry up. Talking to skull is not working. SH
It could cause dread and stress.
They haven't found him yet. Lestrade.
And in Mycrofts case a text could probably change the world as we know it.
But, ever so rarely, there will be a text message that warms John and makes his heart sing.
I miss you. I'm sorry and please come back. SH