“If I am not for myself, who will be for me? And when I am for myself, what am ‘I’? And if not now, when?”
Source: Wikipedia entry on Hillel the Elder.
Update (9:37 AM): This is a quote we should all take to heart. We should be principled and fundamentally independent in our thinking and in our pursuit of happiness, material prosperity, and life. Because life and reason are worth it. And we should take it serious now, not put it all off for some imaginary future time.