NET
27 And he who searches our hearts knows the mind of the Spirit, because the Spirit intercedes on behalf of the saints according to God’s will.
Darby
27 But he who searches the hearts knows what [is] the mind of the Spirit, because he intercedes for saints according to God.
KJV
27 And he that searcheth the hearts knoweth what [is] the mind of the Spirit, because he maketh intercession for the saints according to [the will of] God.