Wisdom of today by Tsong Kha Pa on karma.

Like a poison that has been ingested,
The commission of even small sin.
Creates in your lives hereafter
Great fear and a terrible downfall.

As when grain ripens into a bounty
Even the creation of small merit.
Leads in lives hereafter to great happiness
And will be immensely meaningful as well.

Just as the shadows of birds who dwell

In the sky move along with them,

Beings are followed by

What right and what wrong they have done.

Just as when those with few provisions

Set out on the road and travel in suffering.

Living beings who have not cultivated good karma

Travel to the miserable realms.

Just as when those who have prepared many provisions.

Set out on the road and travel in happiness,

Living beings who have cultivated good karma

Travel to the happy realms.

Do not scorn even the thiniest sin,

Thinking that it will do no harm;

It is through the accumulation of drops of water

That a great vessel gradually fills.

Do no think that the commission

Of even a tiny sin will not pursue you.

Just as a large vessel is filled

By falling drops of water,

So too is a fool filled up with sins.

Accumulated a little at a time.

Do not think that the cultivation.

Of even a tiny virtue will not pursue you.

Just a a large pot is filled

By falling drops of water,

So too are the steadfast filled up

By virtues accumulated a little at a time.

From The Collection on Indicative Verses, Tsong Kha Pa, The Great Treatise on the Stages of the Path to Enlightenment, Volume 1.