We must try to keep our thoughts pure, our ideas upright and our intentions holy. We should also endeavour to have a will that seeks nothing but God and his glory. If we make every effort to advance in this beautiful virtue, he who teaches it will enrich us continually with new light and new heavenly favours. But we will never advance even a single step in this virtue if we do not strive to live in a holy and immutable peace. Jesus' yoke is easy and his burden light, so we should not allow the enemy to creep into our hearts and rob us of this peace.
Peace is simplicity of heart, serenity of mind, tranquillity of soul, the bond of love.
Peace is the way to perfection, indeed in peace is perfection to be found. The devil who is well aware of all this makes every effort to have us lose our peace. We should be on the alert for every slightest sign of agitation and as soon as we realize we have fallen into dejection we must turn to God with filial confidence and abandon ourselves completely to him. All agitation on our part is very displeasing to Jesus, since such uneasiness is never unaccompanied by imperfection and can always be traced to egoism and self-love. The soul must be saddened by one thing alone, offense against God, and even in this we must be very cautious.