The samadhisiddhih Isvarapranidhanat yoga sutra speaks about the state of samadhi that one reaches through the rigorous stages of meticulous intelligence and passionately accurate thought process. However, it easier said than done. One needs to completely accede to the Almighty and release one from the burden of worldly wants.

samadhi absorption, profound meditation, super-consciousness
siddhih God
Isvara by surrender, by resignation, by application
Pranidhanat Surrender to God brings perfection in samadhi.

Samadhi is reached through precision of intelligence and intensity in thought to surrender to God. The power of samadhi comes to the person, who takes refuge in God.

Surrendering to God lets go the sadhaka from the bondage of earthly desires, leads to renunciation of sensuous desires, and fosters within him the most passionate form of application.