We should on no account wear ourselves out with anxiety over our bodily needs. With our whole soul let us trust in God: as one of the Fathers has said, ‘Entrust yourself to the Lord, and all will be entrusted to you.’ ‘Show restraint and moderation,’ writes the Apostle Peter, ‘and be watchful in prayer… casting all your care upon God, since he cares for you’ (1 Pet. 4:7, 5:7). But if you still feel uncertainty, doubting whether he really cares about providing for you, think of the spider and compare it with a human being. Nothing is more weak and powerless than a spider. It has no possessions, makes no journeys overseas, does not engage in litigation, does not grow angry, and amasses no savings. Its life is marked by complete gentleness, self-restraint and extreme stillness. It does not meddle in the affairs of others, but minds its own business; calmly and quietly it gets on with its work. To those who love idleness it says, in effect: ‘If anyone refuses to work, he should have nothing to eat’ (2 Thess. 3:10)… Living in this quiet fashion, humble and weak, never going outside or wandering according to its fancy, always hard at work—nothing could be more lowly than the spider. Nevertheless the Lord, ‘who dwells on high but sees what is lowly’ (Ps. 113:5-6), extends his providence even to the spider, sending it food every day, and causing tiny insects to fall into its web.
One who is enslaved to greed may perhaps object: ‘I eat a great deal, and since this involves me in heavy expenses, I am inevitably tied up with all kinds of worldly business.’ Such a person should think of the huge whales that feed in the Atlantic Ocean: God gives them plenty to eat and they never starve, although each of them swallows daily more fish than a highly populated city would consume. ‘All things wait upon You, to give them their food at the proper time’ (Ps. 104:27). It is God who provides food both for those who eat much and for those who eat little. Bearing this in mind, anyone among you who has a capacious appetite should in the future set his faith entirely in God, freeing his intellect from all worldly distractions and anxieties. ‘Be no longer faithless, but have faith’ (John 20:27). (John of Karpathos, “For the Encouragement of the Monks in India,” §§47-8; in Philokalia, vol. 1, 308-9)
I think the journeying overseas bit is my favourite.