Adverb
In the mind; in thought or meditation; intellectually; in idea.
Source: Webster's dictionaryThose who have truly decided to serve the Lord God should practice the remembrance of God and uninterrupted prayer to Jesus Christ, mentally saying: Lord Jesus Christ, Son of God, have mercy on me, a sinner. Seraphim of Sarov
A servant of the Lord stands bodily before men, but mentally he is knocking at the gates of heaven with prayer. John Climacus
It is practically impossible to teach good programming to students that have had a prior exposure to BASIC: as potential programmers they are mentally mutilated beyond hope of regeneration. Edsger W. Dijkstra
But it is necessary to the happiness of man, that he be mentally faithful to himself. Infidelity does not consist in believing, or in disbelieving; it consists in professing to believe what he does not believe. Thomas Paine
In order to properly understand the big picture, everyone should fear becoming mentally clouded and obsessed with one small section of truth. Xun Zi
Although I was able to maintain a pleasant expression, I was mentally throwing up in her face. Augusten Burroughs