Why is prayer necessary for Christians?

#HC116

Because prayer is the most important part of the thankfulness which God requires of us. Moreover, God will give His grace and the Holy Spirit only to those who constantly and with heartfelt longing ask Him for these gifts and thank Him for them.

Proofs

Because prayer is the most important part of the thankfulness which God requires of us. (Psalm 50:14–15; Psalm 116:12–19; 1 Thessalonians 5:16–18)
Moreover, God will give His grace and the Holy Spirit only to those who constantly and with heartfelt longing ask Him for these gifts and thank Him for them. (Matthew 7:7–8; Luke 11:9–13)