Spurgeon on God's provision

“Jehovah who created all things is equal to every emergency; heaven and earth are at the disposal of Him who made them, therefore let be very joyful in our infinite helper.”

John Calvin on contentment

"the happiness promised us in Christ does not consist in outward advantages--such as leading a joyous and peaceful life, having rich possessions, being safe from all harm, and abounding with delights such as the flesh commonly longs after. No, our happiness belongs to the heavenly life!" John Calvin http://www.reformedtheology.ca/quotes_topic.htm

John Piper on faith

"The gospel has unleashed the omnipotent mercy of God so that thousands of other gifts flow to us from the gospel heart of God. I am thinking of a text like Romans 8:32 'He who did not spare his own Son but gave him up for us all, how will he not also with him graciously give us all things?' This mean that the heart of the Gospel - God's not sparing His own Son - is the guarantee that 'all things' will be given to us.
All things? What does that mean? It means the same thing that Romans 8:28 means: 'And we know that for those who love God all things work together for good, for those who are called according to his purpose.' God takes 'all things' and makes them serve our ultimate good. It doesn't mean we get everything our imperfect hears want. It means we get what's good for us...
The goal of the Gospel is my being so in love with Christ and so passionate about His glory that when my suffering can highlight His worth I will bear it 'gladly (2 Corinthians 12:7-10)'...This goal is not our ease or wealth or safety in this age, but our dependence on Christ and delight in His glory...
'I will go to the altar of God, to God my exceeding joy, (Ps. 43:4).' So faith has tasted the glory of God in Christ and treasures it enough that the fullness of it is worth waiting for and suffering for. Faith has seen the truth that part of Christ's glory is his trustworthiness. Therefore, faith can cast itself on the promise of Christ and trust that the fullness of glory and the fullness of joy will surely come." John Piper

John Calvin on Joy

"We ought to bear in mind, that our happiness consists in this, that his hand is stretched forth to govern us, that we live under his shadow, and that his providence keeps watch and ward over our welfare. Although, therefore, we have abundance of all temporal good things, yet let us be assured that we cannot be truly happy unless God vouchsafe to reckon us among the number of his flock. Besides, we then only attribute to God the office of a Shepherd with due and rightful honor, when we are persuaded that his providence alone is sufficient to supply all our necessities. As those who enjoy the greatest abundance of outward good things are empty and famished if God is not their shepherd; so it is beyond all doubt that those whom he has taken under his charge shall not want a full abundance of all good things. David, therefore, declares that he is not afraid of wanting any thing, because God is his shepherd." John Calvin