He had to go into the shop and _climb up from the bottom_.

There was no other way by which he could come to know how to turn a deadly force into a well-trained necessity.
Yet the average man goes into life with as little knowledge of its forces as the baby who puts its foot upon the third rail.

That fact keeps the thoughtless man down until experience comes to the rescue.
When it does come, _if he has the sand, the common sense, the will to do_, there is naught to hold him away from his goal..