An example

Anas came out of Ramadan having done more than he had ever done. Tahajjud most nights, a juz a day, the masjid for every prayer.

By the middle of Shawwal the tahajjud had gone. By Dhul Qadah the Qur'an was untouched for a fortnight. He still prays his five, and he says he feels nothing in any of them.

What he says to himself is that Ramadan proved what he was capable of, and that the rest of the year proves what he actually is.

Both halves of that sentence are wrong, and the second half is the one doing the damage.