From what sources do aethiests, freethinkers, agnostics (or other non-religious people) draw their inspiration?

From where would guidance, wisdom, advice or other meaningful searches be sought? Are they (or you) open to religious texts if they’re found to be inspirational in some way? Are the inspirational works of non-religious figures held in higher esteem than those of a religious figure?

I’m trying to craft this question as non-confrontational as I can because I’m genuinely interested.