How accurate is it that attaining a tranquil soul (nafs mutma'innah) is achieved by frequently remembering Allah (dhikr Allah) and prostrating often?

Frequent remembrance of Allah (dhikr) and prayer (salat) are among the means of rectifying the soul and increasing faith. Prayer prohibits indecency and evil, and remembrance protects the soul from the dominion of Satan. To the extent that a servant strives against his self by adhering to acts of obedience, his faith increases and his soul finds tranquility. It is necessary to strive against the self, whims, Satan, and the world to attain Allah's pleasure and His Paradise. The commanding soul (an-nafs al-ammarah) and the tranquil soul (an-nafs al-mutma'innah) are adversaries. The commanding soul finds it difficult to work for Allah, while the tranquil soul finds it difficult to work for anyone other than Allah. Victory in this war is achieved through patience, and the ultimate outcome is for the righteous.