What the Holy Bible says about Thankfulness:
16 Rejoice always, 17 pray continually, 18 give thanks in all circumstances; for this is God’s will for you in Christ Jesus. (1 Thessalonians 5: 16-18)
8 Give praise to the Lord, proclaim his name; make known among the nations what he has done. (1 Chronicles 16: 8)
34 Give thanks to the Lord, for he is good; his love endures forever. (1 Chronicles 16: 34)
Shout for joy to the Lord, all the earth. 2 Worship the Lord with gladness; come before him with joyful songs. 3 Know that the Lord is God. It is he who made us, and we are his; we are his people, the sheep of his pasture. 4 Enter his gates with thanksgiving and his courts with praise; give thanks to him and praise his name. 5 For the Lord is good and his love endures forever; his faithfulness continues through all generations. (Psalm 100: 1-5)
6 Do not be anxious about anything, but in every situation, by prayer and petition, with thanksgiving, present your requests to God. 7 And the peace of God, which transcends all understanding, will guard your hearts and your minds in Christ Jesus. (Philippians 4: 6-7)