Thanks @Erith, very true.
It is also important to remember all these gains or falls in the capital value of our long term holdings (particularly real estate) are just pretend money adjustments that may make us feel good (or not!) but ultimately don't mean much until such time as we want to sell them.
It is also easy to feel like a genius in a rising share market. I know I did, until I saw that my 4 year old boy had achieved a 32% return on his portfolio (just holding Vanguard's global tracker denominated in GBP) over 2016. That spanked my returns, and I suspect most folks here.
To celebrate the small wins I gave him a Freddo Frog and some new batteries for his favourite horrible noisy toy car... bit of a parenting fail that!