I think that feeling of insecurity is one of the drivers that makes us learn. I think one quickly realises in this profession that it isn't possible to learn it all, but what we are selling to our employers is our knowledge.

If we want to maintain or increase the value of that offering, we need to keep our knowledge up to date, and add to it as time goes on.

The way I look at it, you can either remember things, or look them up. The things you do frequently, you remember. The things you do occasionally, you end up looking up, which takes longer.