Translation:

109. Which then is best? he that layeth his foundation on piety to Allah and His good pleasure? or he that layeth his foundation on an undermined sand-cliff ready to crumble to pieces? And it doth crumble to pieces with him into the fire of Hell. And Allah guideth not people that do wrong.

Notes (Tafseer)

1359. A man who builds his life on Piety (which includes sincerity and the purity of all motives) and his hopes on the Good Pleasure of Allah, builds on a firm foundation of rock that will never be shaken. In contrast to him is the man who builds on a shifting sand-cliff on the brink of an abyss, already undermined by forces which he does not see. The cliff and the foundations all crumble to pieces along with him, and he is plunged into the Fire of misery from which there is no escape.