Imam As-Sadiq (a.s.) said:
اِتَّقِ اللّه بَعْضَ التُّقَى وَ إنْ قَلَّ وَدَعْ بَيْنَكَ وَ بَيْنَهُ سِتْراً وَ إنْ رَقَّ
Be god-fearing and fear although it may be little, and maintain a curtain between yourself and Him, although it may be thin.1
There are some people who sever all relations between themselves and God . They burn all bridges behind them and close all doors for their return to God as they proceed along the path of sins and mistakes.
Imam As-Sadiq (a.s.), in this pearl of wisdom, advises us not to do that and to maintain a link however flimsy so that one can return one day and find an open door to enter for repentance.