Vous avez cherché: if it was easy (Latin - Anglais)

if it flies it dies
if it flies it dies

act as if it is impossible to fail
Действуй так словно потерпеть неудачу невозможно

live every day as if it were your last
per omnem diem tamquam ultimum

cut off your hand if it offends you as it is better to go through life weak than to enter hell's fire with two good hands.
and whosoever shall offend one of these little ones that believe in me, it is better for him that a millstone were hanged about his neck, and he were cast into the sea.

it is like a man building a house who digs deep, laying the foundation upon the rock; the house cannot be moved by the flood that washes over it because it was founded upon the rock
he is like a man which built an house, and digged deep, and laid the foundation on a rock: and when the flood arose, the stream beat vehemently upon that house, and could not shake it: for it was founded upon a rock.