As a toddler, we learn to walk not by walking, but by falling.

Let us labour therefore to enter into that rest, lest any man fall after the same example of unbelief.

The father catches the boy twice, but the third time steps back and lets him fall.

This fellow wrote: I should be very ashamed were I to fall and people have to help me and realize that I could see only very little.

Visualise them: This should be a no-brainer, but you' d be amazed at how many people fall in this trap.