Chapter 17 - Verse 19

मूढग्राहेणात्मनो यत्पीडया क्रियते तप: ।
परस्योत्सादनार्थं वा तत्तामसमुदाहृतम् ॥ १९ ॥

mūḍha-grāheṇātmano yat
pīḍayā kriyate tapaḥ
parasyotsādanārthaṁ vā
tat tāmasam udāhṛtam


Penance performed out of foolishness, with self-torture or to destroy or injure others, is said to be in the mode of ignorance.

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There are instances of foolish penance undertaken by demons like Hiraṇyakaśipu, who performed austere penances to become immortal and kill the demigods. He prayed to Brahmā for such things, but ultimately he was killed by the Supreme Personality of Godhead. To undergo penances for something which is impossible is certainly in the mode of ignorance.