My favorite US Army phrase:
Train like you fight a war.
Don’t cancel training because it’s raining. During war, you have no choice to wade through the mud to get to the other side.
Don’t stop the march because of blisters on your feet. During war, you would be lucky to have boots to weather the storm.
Don’t be lenient on your staff because the enemy will show no mercy.
If you train like you fight, you will be ready for the worst. If the worst is yet to come, you will come out ahead of all those waiting for the perfect moment that will never come.
To be ready, we must train as if our lives depended on it. To be ready, we must step forward even when we don’t think we have what it takes.