Our life here on Earth has as its purpose precisely to prepare for our eternal happiness. This world is a large womb. It is a 'test' as all opportunities are tests.
Eternal principles that govern happiness apply equally to all.
The meaning of "He will give us all things" can be put thus: one day we will see that nothing - literally nothing - which could have increased our eternal happiness has been denied us, and that nothing - literally nothing - that could have reduced that happiness has been left with us.
Greetings, friends. Do you wish to look as happy as me? Well, you've got the power inside you right now. So use it and send one dollar to Happy Dude, 742 Evergreen Terrace, Springfield. Don't delay. Eternal happiness is just a dollar away.
How glorious and near to the angels is youth that is clean. This youth has joy unspeakable here and eternal happiness hereafter. Sexual purity is youth's most precious possession. It is the foundation of all righteousness.
Ask yourself whether you are happy, and you cease to be so.
For who would dare to assert that eternal happiness can compensate for a single moment's human suffering