This winter I had all my flu shots. Somehow that didn't make a difference because I caught a bug that knocked me out for 3 days and had me operating at half speed for close to 4 weeks.
On the worst day of this affliction (a work day) I went to a local walk in clinic. I expected to have to wait but instead was in and out in less than 5 minutes with a prescription in hand. The piece of paper led me to believe that whatever I had would get knocked down. The drugs helped for a time but it was clear there was no change to my symptom after taking the last pill.
I should have hedged by enacting the age old remedy for colds and flus - drinking lots of liquids and getting rest. The truth is that I didn't rest. The prescription and flu vaccines gave me a feeling of invincibility so I doubled down on the workload.
I learned a valuable lesson from this experience. You must always do more. I'm not just talking about colds or flus. This applies to business or personal issues. You can't rely on a thing like a piece of paper as the only solution to a problem.