time and tide wait for no one
time and tide wait for no one
The opportunities of life will pass you by if you delay or procrastinate in taking advantage of them. You've had so many chances to get research grants or earn a master's degree, but you never get around to applying for any of them. You're going to end up stuck in the same dead-end career for your whole life, if you're not careful—time and tide wait for no one.