Gate 63 is the gate of doubt and questions and line 3 is about finding out, through your trial and error process, whether the understanding and awareness achieved with the new beginning can be continued in the future or not.
So, what you sell to people is what makes them doubt or question:
- what they're doing in the now, so that they can see whether it's something they can still do in the future or not.
- the answers they got for themselves, so that they can see whether they can trust those answers as facts to rely upon in order to project themselves into the future, or not.
- the way they see themselves, so that they can see whether the patterns they got to identify themselves with represent what feels true and right to them in order to build upon them a sense of continuity, or not.