An atheist accepts the situation that he is in. The situation where the knows nothing happens after death. The is no higher power but only instinct, emotions that make one react and make one to live. Survival and replication are reactions based on the situation.

To not be rational but to do as one pleases without understanding the consequences.

When one does this, he claims responsibility to accept that all he has is now, this body and his environment.

Few may accept determinism or fatalism but the rational mind can control his actions, words or company to affect his situation and the situation of others.

The rational mind knows that only sages and gods live a peaceful life for they have the wisdom and knowledge to set an example in this world. However, the sages and gods do not pursue interest as they know that they can be whatever they want. It is only a matter of motivation and/or a matter of necessity.

If there is no necessity, what is the need to put in the effort as the acceptance of understanding that anybody can master of any given subject?

If our living here doesn't matter, no effort that we put in this world matters except for the happiness of one's self & the happiness of others around.

Tip faggotbrains for their post.