Brave mother and brave father means they works in Sunyata, so they are selfless and hence fearless.

勇母及勇父意谓他们在空性中行事，所以他们是无我且无畏。

Developing from the basis of Sunyata thought in Prajnaparamita-Sutra, the sutra is a kind of Mahayana sutra and one of the classics in the early period of Mahayana Buddhism.

此经是在《般若经》空思想的基础上发展出来的一种大乘经，属于早期大乘佛教的经典之一。

Boris asked, "How does one connect Sunyata with Great Compassion?"

博瑞斯问：「由空性出发，如何与大悲连系？」