Charak Samhita
एवमेव विकारोऽपि तरुणः साध्यते सुखम्। विवृद्धः साध्यते कृच्छ्रादसाध्यो वाऽपि जायते ॥१५॥
Just as a tender plant is easy to cut down with a little effort, but the same require great effort when fully grown.
english translation
evameva vikAro'pi taruNaH sAdhyate sukham। vivRddhaH sAdhyate kRcchrAdasAdhyo vA'pi jAyate ॥15॥
hk transliteration by Sanscript