Greatest Boon of Lord Chaitanya
Lord Caitanya has given the greatest boon: in this age one simply has to chant the holy name of God to attain perfection in spiritual life.
Srimad Bhagavatam 3.21.7,
Srila Prabhupada.
One second of human life wasted in the vain research of planning for happiness in the material world can never be replaced even if one spends millions of coins of gold.
If one has killed an animal, one must himself be killed by that same animal. This is called mamsa. Mam means “me,” and sa means “he.” As I am eating an animal, that animal will have the opportunity to eat me.
Srimad Bhagavatam 10.10.14,
Srila Prabhupada
Hankering after material happiness is called Lust & such activities are sure to meet with frustration in the long run.