Final answer:
The purpose of erasing the deep print from the brain is to forget about a troubling or significant event that has made a lasting impression on one's consciousness.
Step-by-step explanation:
The purpose of erasing the deep print from the brain is to forget about the portent. This implies a desire to remove the lingering effects of a troubling or significant vision or event that has etched itself into one's consciousness. The fact that the individual has meditated on it and acquired clarity or insight, yet finds it 'undesirable', suggests that the memory is burdensome and there's a wish to expunge it from thought.