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.
Taking birth in Kali-yuga itself shows that we have no qualification ; Sri Chaitanya Mahaprabhu therefore manifests ultimate mercy.
The rose in the garden gradually takes its shape and color to become beautiful and sweet not by a blind physical law, although it appears like that. Behind that physical law is the direction of the complete consciousness of the Supreme Lord.
Srimad Bhagavatam 2.10.49-50