A little from Master Hua's commentary:
Going and returning with no border. "Going" represents going out, arising, movement, and change. Therefore it is said:
With movement there is change;
With change there is transformation;
In the universe, only those who with total sincerity can effect transformations.
If you are totally sincere, then you can bring about change; but without total sincerity, you cannot. "Returning" represents coming back, extinction, and stillness. What this refers to is movement not obstructing stillness, and stillness not obstructing movement. Movement is stillness, and stillness is movement. Movement and stillness are one suchness. That is why it says, with no border. No border means no boundary, no trace, no path.
Only consider helping others and forget yourself. Master Hsuan Hua