For me, and i think for most people. Life will always be difficult in some manner or another.

Serenity will come and go on the daily or hourly. Serenity can be very fleeting. 

Calmness precedes serenity.

The more of your time you own. The easier you can find the time to chill and calm yourself. 

Therefore an abundance of free time = more chance to do what you enjoy; leading to potentially finding reoccurring serenity on the daily. 

I don’t think serenity should be the goal. Owning your time should be the end game. 

Serenity isn’t some sort of milestones that you achieve and have forever. 

It’s a mindset and lifestyle to aspire towards.