Believe
Trust
To your leader, you say: "Believe and trust in me." The leader doesn't think you can handle your duties, so you have to say this to him. You want him to believe and trust that you're responsible. You can handle this task.
しん
None
None
As you face your leader and say "Believe and trust in me," you kneel down on each shin (しん). You have shin splints, so it hurts a bit, but you do it anyway to show how serious you are.