Thirukkural

தவமும் தவமுடையார்க்கு ஆகும் அதனை அஃதிலார் மேற்கொள் வது.

Thavamum Thavamutaiyaarkku Aakum Adhanai Aqdhilaar Merkol Vadhu

Austerities can only be borne, and their benefits enjoyed, by those who have practised them (in a former birth); it will be useless for those who have not done so, to attempt to practise them (now)