Thanksgiving and gratitude is as applicable toward mankind as it is toward God.
I John 4: 20 If anyone says, “I love God,” yet hates his brother, he is a liar. For anyone who does not love his brother, whom he has seen, cannot love God, whom he has not seen.21 And he has given us this command: Whoever loves God must also love his brother.
So many times when we think of being spiritual we think of the vertical aspect only; Worshipping God, drawing near to God, humbling ourselves before God. Certainly this is an important aspect, but if we leave out the horizontal relationships with people around us, we are falling short of spiritual wisdom. The Bible is loaded with a calling and grace for a life of relationships. The fruit of the Spirit is meant for relationships. We are created as relational beings. Walking in thanksgiving, gratitude, honor and kindness is highly spiritual and creates success with God and man.
The biblical truth is that ultimately our vertical relationship with God can rise no higher than our horizontal relationships. At some point in our walk with Him, God will require that we love our neighbor as He does.
Therefore, if we want more of God, more glory, more mercy, more healing, more of His spirit, the keys of thanksgiving and gratitude, as applied on a horizontal level hold a high importance.
I Peter 3:8 Finally, all of you, live in harmony with one another; be sympathetic, love as brothers, be compassionate and humble.9 Do not repay evil with evil or insult with insult, but with blessing, because to this you were called so that you may inherit a blessing.10 For, “Whoever would love life and see good days must keep his tongue from evil and his lips from deceitful speech.11 He must turn from evil and do good; he must seek peace and pursue it.12 For the eyes of the Lord are on the righteous and his ears are attentive to their prayer, but the face of the Lord is against those who do evil.”
In the words of the apostle, “Seek peace, and pursue it!”