it is unknown
The knees on the trousers are a clue to the mystery because they were digging in the basement. They wanted to get in to the bank vault that was next door.
They indicate that the assistant has been working at an activity on his knees such as digging a tunnel. -by Diana Stefanyuk
The knees were worn, wrinkled, and stained, and Holmes concluded that they got that way because the pawnbroker's assistant had been spending a great deal of time in the dirt on his knees digging the tunnel.
". . . I am sure that you inquired your way merely in order that you might see [John Clay]."___"Not him."___"What then?"___"The knees of his trousers."___"And what did you see?"___"What I expected to see."
Holmes saw all he needed to see from outside the shop: the knees of the assistant's trousers.
Holmes observed that the clay on the assistant's knees and the specific pattern of wear on the right side of his trousers indicated that he had been kneeling in a confined space while using a small pickaxe — both classic signs of tunnel digging.
Because they extend four inches below the knees
1 Hook and pile fasteners tape at the fly 2 Reinforced knees 3 Adjustable suspenders
usually danced shirtless with trousers together with coconut shells around the body. trousers: muslims wear red trousers and blue for the christians coconut shell: 4 pairs of coconut shell. a pair for both leg, located in the knees. 2 pairs for the body, one in front for the chest part and another one at the back. and a pair for the hands(for tapping)
Holmes had formed a theory about what was going on at the pawn shop. He tests his theory with two specific items. Rather than knock on the door, he pounded on the pavement in front of the door with his stick. Seeing the clay on the knees of the pants confirmed that the assistant had been digging.
usually danced shirtless with trousers together with coconut shells around the body. trousers: muslims wear red trousers and blue for the christians coconut shell: 4 pairs of coconut shell. a pair for both leg, located in the knees. 2 pairs for the body, one in front for the chest part and another one at the back. and a pair for the hands (for tapping) by: M'Gee Gonzalez
If you are asking what that means, it means that practical prayer must be followed by action. We have to get up, walk away from the place we were praying, and go DO God's will.