Anything done against faith or conscience is sinful.

Everything that divides men, everything that specified, separates or pens them, is a sin against humanity.

Sin is whatever obscures the soul.

"Every kind of contempt for sex, every impurification of it by means of the concept "impure", is the crime par excellence against life — is the real sin against the holy spirit of life"

My definition of a sin is for humans to allow a species to die out. Animals cannot speak for themselves – it is up to all of us to protect them and their habitats.

sin is always an offense that touches others, that alters the world and damages it.

A crime, which, though perhaps not considered by law as the highest, is in truth and in fact, the blackest sin, which can contaminate the hands, or pollute the soul of man.

It is sinful to cherish those whom heaven has doomed to destruction.

Sin is anti-will to God's will; it sets itself to oppose preaching, prayer, and all the institutions of God.

A sin is anything that you do which goes against yourself.

The real sin against life is to abuse and destroy beauty, even one's own — even more, one's own, for that has been put in our care and we are responsible for its well-being.

When we sin, we sin before God and become enemies of the divine law.

The existence of lover in the pavilion of the Beloved is a sin beyond comparison to any other.

I made a list of things that I might consider sin if the concept of sin were valid:</br>Number 1: Credulity, gullibility. I'd say that's a sin.</br>Voluntary willful ignorance. I'd say that's a sin.</br>Letting fear prevent you from understanding reality. I'd call that a sin.</br>Limiting the rights and freedoms of others in order to make them abide by your standards. That's a sin.</br>Sacrificing the mental, emotional and physical well-being of a child in deference to your religion. That's a sin.</br>Wasting the one and only life that you know you're going to have, worrying about and working for an afterlife that somebody told you might be there. That's a sin.