One of the big things I picked up today that I'm still mulling around my head to comprehend fully is that tomorrow will be better than today.
Rabbi Daniel Lapin talks about this in his book 'Thou Shall Prosper' where we are always valuing what we have in terms of a worst-case scenario, where in actuality, that's very rarely the case. Say you splurge and buy a new car from a dealership; the second you drive it off the lot, it drops quite a bit in value. Does this mean the dealership cheated you? Certainly not; our immediate thought is to go to what it's worth if I had to sell it this minute. However, we don't consider the emotional value of what we get, and that if someone.
I know I'm guilty of this where I value my possessions as if I had to sell them in a pinch, forgetting that if someone offered me the amount I paid for it, I wouldn't take their offer. I paid what I did for a reason, and it's got more value to me in its current state than selling it for what I could make.
Key takeaways:
1) Value is in how much you would part it for, not how much you could get for it
2) We won't typically sell something at the same cost we bought it at