They saw Jesus walking on the lake
In the evening the disciples went down to the shore of the lake and got into a boat to make for Capernaum on the other side of the lake. It was getting dark by now and Jesus had still not rejoined them. The wind was strong, and the sea was getting rough. They had rowed three or four miles when they saw Jesus walking on the lake and coming towards the boat. This frightened them, but he said, ‘It is I. Do not be afraid.’ They were for taking him into the boat, but in no time it reached the shore at the place they were making for.
Source: Jerusalem Bible
Catechism of the Catholic Church
2087 Our moral life has its source in faith in God who reveals his love to us. St. Paul speaks of the “obedience of faith” as our first obligation. He shows that “ignorance of God” is the principle and explanation of all moral deviations. Our duty toward God is to believe in him and to bear witness to him.
2088 The first commandment requires us to nourish and protect our faith with prudence and vigilance, and to reject everything that is opposed to it. There are various ways of sinning against faith:
Voluntary doubt about the faith disregards or refuses to hold as true what God has revealed and the Church proposes for belief. Involuntary doubt refers to hesitation in believing, difficulty in overcoming objections connected with the faith, or also anxiety aroused by its obscurity. If deliberately cultivated doubt can lead to spiritual blindness.
2089 Incredulity is the neglect of revealed truth or the willful refusal to assent to it. “Heresy is the obstinate post-baptismal denial of some truth which must be believed with divine and catholic faith, or it is likewise an obstinate doubt concerning the same; apostasy is the total repudiation of the Christian faith; schism is the refusal of submission to the Roman Pontiff or of communion with the members of the Church subject to him.”
Of David. A maskil. 1 Happy the sinner whose fault is removed, whose sin is forgiven.
Happy those to whom the LORD imputes no guilt, in whose spirit is no deceit.
As long as I kept silent, my bones wasted away; I groaned all the day.
For day and night your hand was heavy upon me; my strength withered as in dry summer heat. Selah
Then I declared my sin to you; my guilt I did not hide. I said, “I confess my faults to the LORD,” and you took away the guilt of my sin. Selah
Thus should all your faithful pray in time of distress. Though flood waters threaten, they will never reach them.
You are my shelter; from distress you keep me; with safety you ring me round. Selah
I will instruct you and show you the way you should walk, give you counsel and watch over you.
Do not be senseless like horses or mules; with bit and bridle their temper is curbed, else they will not come to you.
Many are the sorrows of the wicked, but love surrounds those who trust in the LORD.
Be glad in the LORD and rejoice, you just; exult, all you upright of heart.
Source: The New American Bible