This card reminds me that it's the journey that counts, not the destination.
I used to think that someday, I was finally going to get "there" and then everything would be wonderful forever. But there is no "there". Life is full of high places after travelling the low places, but none of them is forever. Just as the saying "this too shall pass" applies to the low places, it also applies to the high places.
In my early years of sobriety, I'd come through a gruelling phase of recovery and get to a place of serenity and contentment, and then some old-timer would wink and tell me "this too shall pass".

I hated that. Sure enough, "this too" did pass, alright, and I'd be in another difficult phase of recovery, having to work through that one to get to the next patch of serenity.
The guy on this card has gotten complacent, not realizing he's due for a wake-up call shortly.