What does failure teaches success mean?

Success is as easy as failure. 

If you could only see the whole structure for one illuminating instant! It is the digging out of the thing, one limb at a time, which requires such tedious effort. Two elements combine to bring this about―first the building of the individual ego as an independent force, and second, the bringing into proper relationship of your threefold nature―atomic, mental and psychic. 

Sit in the silence, and wait until your inner sense tells you what is needed to right your balance and allow your further progress.