Thankfullness

We ought to give thanks for all fortune: if it is good, because it is good, if bad, because it works in us patience, humility and the contempt of this world and the hope of our eternal country." 
-- C.S. Lewis (1898-1963), Novelist, poet and Christian apologist.

"Let us thank God heartily as often as we pray that we have His Spirit in us to teach us to pray. Thanksgiving will draw our hearts out to God and keep us engaged with Him; it will take our attention from ourselves and give the Spirit room in our hearts." 
--Andrew Murray (1828-1917), South African born missionary and minister.

Thankfulness of Heart and Mind

"A thankful heart is one of the primary identifying characteristics of a believer. It stands in stark contrast to pride, selfishness, and worry. And it helps fortify the believer's trust in the Lord and reliance of His provision, even in the toughest times. No matter how choppy the seas become, a believer's heart is buoyed by constant praise and gratefulness to the Lord." 
--John MacArthur, American pastor, teacher, speaker, author.