Musar zu Tehillim 2:11

And this is what is meant: "Serve the Lord with fear" (Ps. 2:11) — the fear of losing His love" and rejoice with trembling out of this great fear of losing the love of the Creator, rejoice that you have the opportunity to do His will.

When he contemplates all of this, it will be impossible for his heart to not fear and for him to not quiver while he speaks his words before Him, blessed be He, and utters His Name, and strives to find His favor. This is what scripture says: "Serve G-d with fear, and rejoice in trembling" (Tehilim 2:11), and "G-d is revered in the great council of the holy ones and feared by all around Him"(Tehilim 89:8).

We thus see that, one must not judge the piety of an act by itself alone. Rather, one must view it from all angles that human intellect can foresee before he can truthfully judge whether it is better to do it or to abstain from it.