"I'll think about it."
Eren responded to the goddess Great Mother's proposal, tactically refusing to commit.
Although he liked the goddess' proposal and thought it feasible for him, he wanted to see what the witch goddess had to say to him.
Only after hearing the other side and weighing the pros and cons of his potential actions would he allow himself to proceed forward.
The goddess Great Mother didn't mind. She also half-expected Eren to respond this way. She was even impressed by him because of how level-headed he was to her proposal.
She was sure that any other demigod in his shoes would have a hard time keeping their cool.
Of course, since she had expected this, the goddess Great Mother hadn't shared the complete coordinates of the blue planet that was housing an Elder Seed Artifact at the time.
The reason she had created the consciousness-pulling formation and gave him partial coordinates was to create intrigue in Eren's mind.