In Spirit = through the guidance of the Holy Spirit, His love and grace, growing in the Fruits therein
Galatians 5:22-24
New King James Version (NKJV)
22 But the fruit of the Spirit is love, joy, peace, longsuffering, kindness, goodness, faithfulness, 23 gentleness, self-control. Against such there is no law. 24 And those who are Christ’s have crucified the flesh with its passions and desires.
In Truth = discerning between Good and Evil by rightly dividing His words and your life experience to know the TRUE will of God for yourself and this world, discerning between the spirits and the words of people, growing in Wisdom
Hebrews 5:12-14
New King James Version (NKJV)
12 For though by this time you ought to be teachers, you need someone to teach you again the first principles of the oracles of God; and you have come to need milk and not solid food. 13 For everyone who partakes only of milk is unskilled in the word of righteousness, for he is a babe. 14 But solid food belongs to those who are of full age, that is, those who by reason of use have their senses exercised to discern both good and evil.
Hebrews 4:12
For the word of God is living and powerful, and sharper than any two-edged sword, piercing even to the division of soul and spirit, and of joints and marrow, and is a discerner of the thoughts and intents of the heart.
Do you know how to use your sword?