Twenty years of teaching and then the passion going, gradually, with politics and parents and student problems building until coming to work stopped being worth it. Clark McCrain puts that in a devotional rather than in a career post, and it is the most honest thing on the blog.
His time management material runs as a numbered series aimed at offices rather than at entrepreneurs. The questions it opens with are the right ones. Are you working efficiently, is your output acceptable to you, and what keeps pulling you away from it.
The devotionals carry dates and address people who share the faith, and they are the reason the rest holds together at all.
Elsewhere there are celebrity and sports posts, including one about a footballer's wife criticising his teammates, written with obvious enjoyment.
Read the devotional about leaving teaching. It explains why somebody starts writing after twenty years of doing something else entirely.