If you start, make it done

The Holy Prophet of Islam (peace be upon him and his progeny) said:
“إسْتِتْمامُ الْمَعْرُوفِ خَيْرٌ مِنْ إِبْتِدائهِ”

Translation
Completion and continuation of a good deed is better and more important than beginning it.

Brief Description
We often see useful projects and actions in the milieu of our social life which are left uncompleted. Their doers have started them under the influence of a sudden motive, but they have lost their enthusiasm very soon and have left them uncompleted. Islam admires faithful and diligent individuals who accomplish the useful work which they commence.1[divider]
•    1. Nahjul Fasahah