No cause occurs without effect, and no effect occurs without cause. No unjust action goes without penalty, and no action or thought flows unnoticed throughout the universe.

No effect occurs without cause, and no cause occurs without effect. No unjust action goes without penalty, and no action or thought flows unnoticed throughout the universe.

[...] c’est que jamais rien n’arrive, sans qu’il y ail une cause ou du moins une raison déterminante, c’est-à-dire quelque chose qui puisse servir à rendre a priori, pourquoi cela est existant plulôt que de toute autre façon. Ce grand principe a lieu dans tous les événements, et on ne donnera jamais un exemple contraire : et quoique le plus souvent ces raisons déterminantes ne nous soient pas assez connues, nous ne laissons pas d’entrevoir qu’il y en a.
Essais de Théodicée, 1.44

Nothing in this world happens by chance.

[Leibniz] has this ... "that nothing happens without a reason why it should be so..."

Nothing happens or comes to be without being thought first:

Nothing happens by blind chance.

nothing happens unless you make it happen.

Everything happens for a reason.

Everything happens for a reason.

Nothing in this world happens by chance

Everything happens for a reason

There is no such thing as chance; and what seems to us merest accident springs from the deepest source of destiny.

If everything must have a cause, then God must have a cause. If there can be anything without a cause, it may just as well be the world as God, so that there cannot be any validity in that argument. It is exactly of the same nature as the Hindu's view, that the world rested upon an elephant and the elephant rested upon a tortoise; and when they said, "How about the tortoise?" the Indian said, "Suppose we change the subject." The argument is really no better than that.