The greater the treasure, the more assiduously one stands sentry over it. The same applies with the Qurb of Allah (SWT). The more one has, the more he or she will avoid anything that could potentially place it in jeopardy.
Nature is thus: what holds substance is pulled rapidly to the earth, while hot air so quickly riseth. How distant the hallowed and the hallow - the head prostrate and that in the sky.
By taking the first step on the road that leads to a sin, one has already passed the point of no return -- particularly when the road is well traveled.