أرْبَعٌ مَنْ اُعْطِيَهُنَّ فَقَدْ اُعْطِيَ خَيْرَ الدُّنْيا وَالآخِرَةِ : صِدْقُ حَديث، وَأداءُ أمانَة، وَ عِفَّةُ بَطْن، وَ حُسْنُ خُلق

Four virtues, whoever has them will have the good of this world and the afterworld: honesty of speech, rendering of trusts (being trustworthy), eating from lawful sources, and possessing good manners.

This quote summarized four important virtues to be perfected by a Muslim in his lifetime. Follow these links to know more about them:

Keeping Trust Preserves Islam

Corruption leads to the fall of the Nation