We pray not to inform God or instruct Him but to beseech Him closely, to be made intimate with Him, by continuance in supplication; to be humbled; to be reminded of our sins.
Be ashamed when you sin, not when you repent.
It is folly to abstain all day long from food, but fail to abstain from sin and selfishness.
Laughter does not seem to be a sin, but it leads to sin.