Beware of self-confidence. Judas was a very confident man of himself. Last of all Judas said, "Master, is it I?" (Matt. 26:25). But he that was last in the suspicion was first in the transgression. "He that trusteth in his own heart is a fool," saith Solomon (Prov. 28:26). It will be your wisdom to keep a jealous eye upon your own hearts and still suspect their fairest pretenses.
We are proud creatures, full of self-confidence, and therefore God, by strange and unexpected providences doth hedge up our way with thorns and wall up our path with hewn stones, brings to despair even of life, bereaves us of counsel, drives us from all our own shifts and policies, brings us under the very sentence of death that we might not trust in ourselves, but in God which raises the dead. He unbottoms us by despair, convinces us of our impotence and folly, shows us what babies and fools we are in ourselves, that in all our future hazards and fears we might know nothing but God.
We walk into the future in God-glorifying confidence, not because the future is known to us but because it is known to God. And that's all we need to know. Worry about the future is not simply a character tic, it is the sin of unbelief, an indication that our hearts are not resting in the promises of God.