Fearing Gd in the Truest Sense When Petitioning Hashem in Prayer

Before we petition the L-rd in prayer, our hearts should be striken with fear of Gd, as we are requesting a change to reality, and in fact questioning if our L-rd's oversight of the universe is insufficient.

It is this way: sometime the Torah records the sins of the patriarchs and matriarchs of the religion.  We know in Torah that it is a sin to marry sisters, and yet Jacob married the sisters Leah, and then Rachel.  This was out of Hashem's grace, and nothing else.  When or if someone tries to recreate the idea of Jacob's marriage to sisters, it is but an abomination.

It is the same way with Abraham.  Abraham stood before the Creator of the universe and pleaded that Sodom would not be destroyed.  Abraham petitioned G-d, which is completely audacious, and yet Gd did not annihilate Him because Abraham had proved himself worthy of Gd’s love through not sacrificing his son Isaac.

To those of us who take prayer lightly, I really feel that this is almost as the way a child perceives the world.  A child does not know what to fear, and must learn fear.  Thus, for those that petition Gd lightly, I believe His response is distant.  However, for Abraham and those who know Gd; great fear of Gd is upon them when they pray.