Do not take vows, for a vow has no effect against Fate; it is only from the miserly that something is extracted.
أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ تَنْذُرُوا فَإِنَّ النَّذْرَ لاَ يُغْنِي مِنَ الْقَدَرِ شَيْئًا وَإِنَّمَا يُسْتَخْرَجُ بِهِ مِنَ الْبَخِيلِ