Praxis Grammatica - Part of the Serenity Prayer?

The 17th century Praxis Grammatica tells you what's just not worth it:

[ 404 ] Stultum est timere, quod vitari non potest.
[Anglice (English Translation)]

• How to Pronounce Latin
• Table of Latin Pronouns
• Latin Infinitives
• What Do the Tenses Mean?

Please post in the comments about this bit of wisdom from Praxis Grammatica.