New Testament scholar Tom Wright offers wise words on this passage saying:
"It isn't a matter of 'rules and regulations' on the one side and 'anything goes' or 'do your own thing' on the other, as many today wrongly imagine. It was a matter of God's new initiative in and through Jesus. Like someone triumphantly putting the ceiling on the ground floor of the house they're building, this then creates the floor for the next storey. Jesus was declaring, by his actions as well as his words, that the ground floor was complete, and that it was time to start work on the upper floor, not because the ground floor was a failure but because its job was done. And the view from upstairs would, in some respects, be significantly different."
-excerpt from Lent for Everyone: Year B, Mark by Tom Wright (69).