भावितं तीव्रवेगेन यद्वस्तु निश्चयात्मना ।पुमांस्तद्धि भवेच्छीघ्रं ज्ञेयं भ्रमरकीटवत् ॥ १४० ॥
In plain words
Whatever you hold in mind with fierce intensity, with a conviction that never wavers, that is what you swiftly become. Know it from the wasp and the grub.
Close to the Sanskrit
Whatever thing is dwelt upon with intense force, by a mind whose nature is firm conviction, that indeed the man quickly becomes — this is to be known, as in the case of the wasp and the grub.