A person who is psychic is following a line of probability to see a probable future; but it can change. Another causal fact will interfere and that future won't happen.
Twere better to be born a stone Of ruder shape, and feeling none, Than with a tenderness like mine And sensibilities so fine! Ah, hapless wretch! condemn'd to dwell Forever in my native shell, Ordained to move when others please, Not for my own content or ease; But toss'd and buffeted about, Now in the water and now out.