Parable of the dripping water on stone and parable of little flame on glass

 HH
In Avos DiR' Nussun chapter 6 we learn that Rabbi Akiva drew great encouragement and hope from seeing how drops of water wore down stone - certainly words of Torah which is likened to iron can reach and mold his heart.

If you put a small flame to glass, the heat accumulates until the glass explodes. So keep pouring out holy words of prayer and Torah, eventually they accumulate and you will be on fire.

Na Nach Nachma Nachman MayUman