"This religion is ease, and no one makes the religion a matter of harshness except that it overcomes him. So be balanced, come close, and receive glad tidings."
Narrated from Abū Hurayrah. Ṣaḥīḥ al-Bukhārī 39 (Kitāb al-Īmān).
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In Istiqāmah: Small and Steady
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Lan yushādda'd-dīna aḥadun illā ghalabah. No man wrestles with this religion — pushes it into severity, tries to overpower it with intensity — except that it defeats him.
Read that as the prediction it is. It does not say the over-ambitious man will be blamed. It says he will be overcome — not punished, outlasted. The religion will still be there, going at its own steady pace, long after his sprint has ended.
Qur'anic Arabic is reproduced in the Uthmani script. Hadith Arabic is reproduced from the published collections named above. The English is a rendering informed by widely used translations, offered as an aid to meaning and not a substitute for the Arabic. Verify what is cited, and consult people of knowledge on anything affecting practice.