Shiva Purana
सिद्धस्य भजते रूपं कांतिं मेधां पराक्रमम् ॥ शौर्यं वायुसमो गत्या सौख्यं श्लाघ्यं परं सुखम् ॥ १४ ॥
He can assume the form of a Siddha. He gets lustre, intelligence, exploits, valour, happiness and the speed of the wind.
english translation
siddhasya bhajate rUpaM kAMtiM medhAM parAkramam ॥ zauryaM vAyusamo gatyA saukhyaM zlAghyaM paraM sukham ॥ 14 ॥
hk transliteration by Sanscript