Charak Samhita
अनेनोपदेशेन नानौषधिभूतं जगति किञ्चिद्द्रव्यमुपलभ्यते तां तां युक्तिमर्थं च तं तमभिप्रेत्य ॥१२॥
॥ Existance of panchamahabhuta in universe॥ On this basis, there is no substance in the universe which cannot be used as a medicinal drug, on the condition that they are used with rational method and with a definite objective.
english translation
anenopadezena nAnauSadhibhUtaM jagati kiJciddravyamupalabhyate tAM tAM yuktimarthaM ca taM tamabhipretya ॥12॥
hk transliteration by Sanscript