cannot be made straight even by application of spells or mantras

दुर्जनस्य श्वपुच्छस्य व्याळस्योष्ट्रगळस्य च।

न मन्त्रैः नौषधैर्वापि ऋजुता जातु जायते॥

रामायणमञ्जरी ६-३१३

durjanasya śvapucchasya vyāḻasyoṣṭragaḻasya ca|

na mantraiḥ nauṣadhairvāpi ṛjutā jātu jāyate||

rāmāyaṇamañjarī 6-313

A very funny quote from Ramayanamanjari of Kshemendra

Some things will never remain straight

Meaning of the slokam

---------------------------

The mind, attitude and the activities of people with evil propensities

The tail of a dog

The body of a snake

The hump of a camel

These cannot be made straight even by application of spells or mantras or administration of medicine.. Simply they will never become straight..

-----------------------------

Maybe the tail of the dog, the snake or the hump at the back of a camel may be temporarily removed by strenuous means, but the mind of a crook can never be straightened.. Sure..

Analysis..

------------

दुर्जनस्य evil minded people

श्वपुच्छस्य tail of a dog

व्यालस्य snake

उष्ट्रगलस्य hump at the neck of a camel

च too

मन्त्रैः by spells

औषदैः by medicines, drugs

वा अपि either

जातु ever

ऋजुता straightening, being straight

न जायते never happens.